Scourge of Valkas

a Dragon attacks — 474 cards in the game can cause this (Scourge of Valkas is one).

When Scourge of Valkas attacks:

1. Silumgar, the Drifting Death — shrinks a creature by -1/-1
2. Utvara Hellkite — makes a token
3. The Ur-Dragon — draws you that many cards
4. Atarka, World Render — grants double strike
5. Kolaghan, the Storm's Fury — gives +1/+0
6. Invasion of Tarkir // Defiant Thundermaw — deals 2 damage
7. Ojutai, Soul of Winter — taps a creature, artifact, enchantment, planeswalker or battle an opponent controls
8. Dromoka, the Eternal — puts a counter on a permanent

a Dragon deals combat damage — 474 cards in the game can cause this (Scourge of Valkas is one).

When Scourge of Valkas deals combat damage:

1. Parapet Thrasher — triggers
2. Broodcaller Scourge — puts a permanent onto the battlefield
3. Zurgo and Ojutai — triggers

a nontoken Dragon enters the battlefield — 484 cards in the game can cause this (Scourge of Valkas is one).

When Scourge of Valkas enters:

1. Lathliss, Dragon Queen — makes a token
2. Miirym, Sentinel Wyrm — makes a token

a Dragon enters the battlefield — 524 cards in the game can cause this.

1. Dragon Tempest — When Scourge of Valkas enters, Dragon Tempest deals damage
2. Bloomvine Regent // Claim Territory — When Scourge of Valkas enters, Bloomvine Regent // Claim Territory gains you 3 life
3. Sarkhan, Dragon Ascendant — When Scourge of Valkas enters, Sarkhan, Dragon Ascendant puts a +1/+1 counter on itself
4. Ganax, Astral Hunter — When Scourge of Valkas enters, Ganax, Astral Hunter makes a token
5. Bladewing's Thrall — When Scourge of Valkas enters, Bladewing's Thrall returns itself from the graveyard
6. Sarkhan, Soul Aflame — When Scourge of Valkas enters, Sarkhan, Soul Aflame copies a permanent
7. Traxos, Scourge Eternal — When Traxos, Scourge Eternal enters, Scourge of Valkas deals damage
8. Terror of the Peaks — When Terror of the Peaks enters, Scourge of Valkas deals damage
9. Twinflame Tyrant — When Twinflame Tyrant enters, Scourge of Valkas deals damage
10. Swashbuckler Extraordinaire — When Swashbuckler Extraordinaire enters, Scourge of Valkas deals damage
11. Vengeful Ancestor — When Vengeful Ancestor enters, Scourge of Valkas deals damage
12. Desert Were-Worm — When Desert Were-Worm enters, Scourge of Valkas deals damage
13. Manaform Hellkite — When a Dragon enters thanks to Manaform Hellkite, Scourge of Valkas deals damage
14. Livaan, Cultist of Tiamat — When Livaan, Cultist of Tiamat enters, Scourge of Valkas deals damage
15. Capricious Hellraiser — When Capricious Hellraiser enters, Scourge of Valkas deals damage
16. Rite of the Dragoncaller — When a Dragon enters thanks to Rite of the Dragoncaller, Scourge of Valkas deals damage
17. Teeming Dragonstorm — When Scourge of Valkas enters, Teeming Dragonstorm triggers
18. Corroding Dragonstorm — When Scourge of Valkas enters, Corroding Dragonstorm triggers
19. Roiling Dragonstorm — When Scourge of Valkas enters, Roiling Dragonstorm triggers
20. Breaching Dragonstorm — When Scourge of Valkas enters, Breaching Dragonstorm triggers

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

anything deals noncombat damage — 3,068 cards in the game can cause this (Scourge of Valkas is one).

When Scourge of Valkas deals noncombat damage:

1. Quest for Pure Flame — puts a quest counter on itself
2. Soul-Scar Mage — puts that many counters on a permanent
3. Fear of Burning Alive — deals that amount damage
4. Niv-Mizzet, Visionary — draws you that many cards
5. Chandra's Incinerator — deals that much damage
6. Chandra's Pyreling — gets +1/+0
7. Talon of Pain — puts a charge counter on itself
8. Asgardian Inspiration — returns itself from the graveyard
9. Thor, Guardian of Midgard — exiles a card from your library
10. Virtue of Courage // Embereth Blaze — exiles a card from your library

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

life is lost — 3,160 cards in the game can cause this (Scourge of Valkas is one).

When Scourge of Valkas makes a player lose life:

1. Far Fortune, End Boss — raises your speed
2. Zahur, Glory's Past — raises your speed
3. Mendicant Core, Guidelight — raises your speed
4. Aether Syphon — raises your speed
5. Vnwxt, Verbose Host — raises your speed
6. Embalmed Ascendant — raises your speed
7. Slick Imitator — raises your speed
8. Oath of Lim-Dûl — sacrifices an enchantment
9. Marina Vendrell's Grimoire — triggers
10. Lich's Mastery — triggers

46 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 (Scourge of Valkas is one).

When Scourge of Valkas attacks:

1. Anthem of Rakdos — gives +2/+0
2. Adaptive Omnitool — searches a library
3. Saw — sacrifices a creature

187 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 (Scourge of Valkas is one).

When Scourge of Valkas attacks:

1. Temmet, Naktamun's Will — draws you 1 card
2. Invisible Woman — triggers
3. Caesar, Legion's Emperor — sacrifices a creature
4. Guide of Souls — triggers
5. Campsite Cuisine — sacrifices a Food
6. Gossip's Talent — triggers

116 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 (Scourge of Valkas is one).

1. Tide of War — When Scourge of Valkas blocks, Tide of War sacrifices a creature

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

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

When Scourge of Valkas 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

304 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 (Scourge of Valkas is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Scourge of Valkas enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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