Fiendish Duo

hits creature — 2,298 cards in the game can cause this.

1. Jalira, Master Polymorphist — Jalira, Master Polymorphist can put Fiendish Duo onto the battlefield from your library
2. Kethek, Crucible Goliath — Kethek, Crucible Goliath can put Fiendish Duo onto the battlefield from your library
3. Polymorph — Polymorph can put Fiendish Duo onto the battlefield from your library
4. Birthing Ritual — Birthing Ritual can put Fiendish Duo onto the battlefield from your library
5. Industrial Advancement — Industrial Advancement can put Fiendish Duo onto the battlefield from your library
6. Killer Instinct — Killer Instinct can put Fiendish Duo onto the battlefield from your library
7. Arthur, Marigold Knight — Arthur, Marigold Knight can put Fiendish Duo onto the battlefield from your library
8. Proteus Staff — Proteus Staff can put Fiendish Duo onto the battlefield from your library
9. Synthetic Destiny — Synthetic Destiny can put Fiendish Duo onto the battlefield from your library
10. Divergent Transformations — Divergent Transformations can put Fiendish Duo onto the battlefield from your library
11. Transmogrify — Transmogrify can put Fiendish Duo onto the battlefield from your library
12. Lukka, Coppercoat Outcast — Lukka, Coppercoat Outcast can put Fiendish Duo onto the battlefield from your library
13. Identity Echo — Identity Echo can put Fiendish Duo onto the battlefield from your library

10 other cards care about it too. These are the ones with the most connections.

anything attacks — 17,934 cards in the game can cause this (Fiendish Duo is one).

When Fiendish Duo attacks:

1. Far Fortune, End Boss — deals 1 damage
2. Temmet, Naktamun's Will — draws you 1 card
3. Grim Javelineer — gives +1/+0
4. Invisible Woman — triggers
5. Caesar, Legion's Emperor — sacrifices a creature
6. Guide of Souls — triggers
7. Campsite Cuisine — sacrifices a Food
8. Gossip's Talent — triggers
9. Banon, the Returners' Leader — draws and discards
10. Toph, Earthbending Master — puts a counter on a permanent

111 other cards care about it too. These are the ones with the most connections.

a creature attacks — 17,934 cards in the game can cause this (Fiendish Duo is one).

When Fiendish Duo attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
5. Chorale of the Void — brings a card back
6. Saw — sacrifices a creature
7. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
8. Ultima Weapon — kills a creature an opponent controls
9. Path of Mettle // Metzali, Tower of Triumph — triggers
10. Total War — kills a creature

181 other cards care about it too. These are the ones with the most connections.

a creature blocks — 17,934 cards in the game can cause this (Fiendish Duo is one).

When Fiendish Duo blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Favor of the Woods — gains you 3 life
7. Tide of War — sacrifices a creature
8. Dead-Iron Sledge — kills a creature
9. Dwindle — kills a creature
10. Shield of the Righteous — triggers

18 other cards care about it too. These are the ones with the most connections.

a nontoken creature attacks — 17,934 cards in the game can cause this (Fiendish Duo is one).

When Fiendish Duo attacks:

1. Mardu Ascendancy — makes a token
2. Basri Ket — makes a token
3. Militia's Pride — makes a token

a creature deals combat damage — 17,934 cards in the game can cause this (Fiendish Duo is one).

When Fiendish Duo deals combat damage:

1. Locutus of Borg — makes a token
2. Antagonist Incorporator — makes a token
3. Hive Mind Coprocessor — makes you lose life

194 other cards care about it too. These are the ones with the most connections.

anything deals combat damage — 17,934 cards in the game can cause this.

When Fiendish Duo deals combat damage:

1. Akki Lavarunner // Tok-Tok, Volcano Born — adds 1 to the damage
2. Embermaw Hellion — adds 1 to the damage
3. Torbran, Thane of Red Fell — adds 2 to the damage

17,931 other cards cause it too. These are the ones with the most connections.

a creature is cast — 18,010 cards in the game can cause this (Fiendish Duo is one).

When Fiendish Duo is cast:

1. Primeval Bounty — makes a token
2. Bloodbond March — brings a card back
3. Dancing from Dark to Dawn — puts that spell's mana value counters on a creature
4. Endrek Sahr, Master Breeder — makes that spell's mana value tokens
5. Summon: Fenrir — it arrives with counters thanks to Summon: Fenrir
6. Summon: Brynhildr — grants haste
7. Skittering Horror — sacrifices itself

84 other cards care about it too. These are the ones with the most connections.

a creature it boosts — 19,392 cards in the game can cause this.

1. Vanquisher's Banner — Vanquisher's Banner gives Fiendish Duo bigger stats
2. Vibrating Sphere — Vibrating Sphere gives Fiendish Duo bigger stats
3. Quest for the Goblin Lord — Quest for the Goblin Lord gives Fiendish Duo bigger stats
4. Memorial Team Leader — Memorial Team Leader gives Fiendish Duo bigger stats
5. Chronicle of Victory — Chronicle of Victory gives Fiendish Duo bigger stats
6. Door of Destinies — Door of Destinies gives Fiendish Duo bigger stats
7. Infinite Hourglass — Infinite Hourglass gives Fiendish Duo bigger stats
8. Icon of Ancestry — Icon of Ancestry gives Fiendish Duo bigger stats
9. Caged Sun — Caged Sun gives Fiendish Duo bigger stats
10. Gauntlet of Might — Gauntlet of Might gives Fiendish Duo bigger stats

19,382 other cards cause it too. These are the ones with the most connections.

a creature it grants abilities to — 19,392 cards in the game can cause this.

1. Hexing Squelcher — Hexing Squelcher gives Fiendish Duo ward
2. Bloodcrusher of Khorne — Bloodcrusher of Khorne gives Fiendish Duo trample
3. Two-Headed Giant of Foriys — Two-Headed Giant of Foriys gives Fiendish Duo an extra ability
4. Foriysian Totem — Foriysian Totem gives Fiendish Duo an extra ability
5. Echo Circlet — Echo Circlet gives Fiendish Duo an extra ability
6. Vanguard's Shield — Vanguard's Shield gives Fiendish Duo an extra ability
7. Akroma's Memorial — Akroma's Memorial gives Fiendish Duo flying, haste, protection, trample and vigilance
8. Goblin War Drums — Goblin War Drums gives Fiendish Duo menace
9. Street Riot — Street Riot gives Fiendish Duo trample

19,383 other cards cause it too. These are the ones with the most connections.

a creature it applies speed increase to — 19,392 cards in the game can cause this.

1. Urabrask the Hidden — Urabrask the Hidden gives Fiendish Duo haste
2. Tannuk, Steadfast Second — Tannuk, Steadfast Second gives Fiendish Duo haste
3. Tuktuk Rubblefort — Tuktuk Rubblefort gives Fiendish Duo haste
4. Anger — Anger gives Fiendish Duo haste
5. Thousand-Year Elixir — Thousand-Year Elixir gives Fiendish Duo haste
6. Barbarian Class — Barbarian Class gives Fiendish Duo haste
7. Emblem of the Warmind — Emblem of the Warmind gives Fiendish Duo haste
8. Fervor — Fervor gives Fiendish Duo haste
9. Rage Reflection — Rage Reflection gives Fiendish Duo haste
10. Rising of the Day — Rising of the Day gives Fiendish Duo haste

19,382 other cards cause it too. These are the ones with the most connections.

a creature it applies extra combat to — 19,392 cards in the game can cause this.

1. Swinging Ship — Swinging Ship gives Fiendish Duo its extra combat

19,391 other cards cause it too. These are the ones with the most connections.

a creature it grants types to — 19,392 cards in the game can cause this.

1. Amorphous Axe — Amorphous Axe gives Fiendish Duo an extra creature type
2. Runed Stalactite — Runed Stalactite gives Fiendish Duo an extra creature type

19,390 other cards cause it too. These are the ones with the most connections.

a creature it makes cheaper to cast — 19,392 cards in the game can cause this.

1. Herald's Horn — Herald's Horn reduces what Fiendish Duo costs
2. Planar Gate — Planar Gate reduces what Fiendish Duo costs
3. Urza's Incubator — Urza's Incubator reduces what Fiendish Duo costs

19,389 other cards cause it too. These are the ones with the most connections.

a creature enters the battlefield — 19,800 cards in the game can cause this (Fiendish Duo is one).

When Fiendish Duo enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Ray Fillet, Wave Warrior — puts a counter on itself
3. The Neutrinos — gets +1/+0
4. Wingnut, Bat on the Belfry — grants flying, haste and menace
5. Aetherstorm Roc — puts a counter on a permanent you control
6. Raphael, Most Attitude — exiles a card from your library

299 other cards care about it too. These are the ones with the most connections.

anything enters the battlefield — 26,499 cards in the game can cause this (Fiendish Duo is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Fiendish Duo enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

39 other cards care about it too. These are the ones with the most connections.