Tainted Observer

you proliferate — 90 cards in the game can cause this (Tainted Observer is one).

When Tainted Observer proliferates:

1. Scheming Aspirant — makes each opponent lose 2 life
2. Ezuri, Stalker of Spheres — draws you 1 card
3. Voidwing Hybrid — returns itself from the graveyard
4. Venser, Corpse Puppet — triggers

1 other card cares about it too. These are the ones with the most connections.

a Bird attacks — 486 cards in the game can cause this (Tainted Observer is one).

When Tainted Observer attacks:

1. Hermes, Overseer of Elpis — scries
2. Choco, Seeker of Paradise — puts a land onto the battlefield

a Bird creature is cast — 486 cards in the game can cause this (Tainted Observer is one).

1. Chocobo Camp — When Tainted Observer is cast, it arrives with counters thanks to Chocobo Camp

1 other card cares about it too. These are the ones with the most connections.

a Bird deals combat damage — 486 cards in the game can cause this (Tainted Observer is one).

1. Kastral, the Windcrested — When Tainted Observer deals combat damage, Kastral, the Windcrested triggers

a nontoken Bird enters the battlefield — 487 cards in the game can cause this (Tainted Observer is one).

1. Knightfisher — When Tainted Observer enters, Knightfisher makes a token

a Phyrexian attacks — 495 cards in the game can cause this (Tainted Observer is one).

1. Vulpine Harvester — When Tainted Observer attacks, Vulpine Harvester brings a card back

a nontoken Phyrexian enters the battlefield — 496 cards in the game can cause this (Tainted Observer is one).

1. Darksteel Splicer — When Tainted Observer enters, Darksteel Splicer makes a token

a Phyrexian enters the battlefield — 524 cards in the game can cause this (Tainted Observer is one).

1. Essence of Orthodoxy — When Tainted Observer enters, Essence of Orthodoxy puts a counter on a permanent

a Bird enters the battlefield — 538 cards in the game can cause this (Tainted Observer is one).

1. Salvation Swan — When Tainted Observer enters, Salvation Swan flickers a creature you control

1 other card cares about it too. These are the ones with the most connections.

anything gets a counter — 4,415 cards in the game can cause this (Tainted Observer is one).

1. Aether Revolt — When a permanent gets a counter thanks to Tainted Observer, Aether Revolt deals that much damage
2. Territorial Gorger — When a permanent gets a counter thanks to Tainted Observer, Territorial Gorger gets +2/+2
3. Fabrication Module — When a permanent gets a counter thanks to Tainted Observer, Fabrication Module puts a counter on a creature
4. All Will Be One — When a permanent gets a counter thanks to Tainted Observer, All Will Be One deals that much damage
5. Lonis, Genetics Expert — When Lonis, Genetics Expert gets a counter thanks to Tainted Observer, it triggers

4 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 (Tainted Observer is one).

When Tainted Observer 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 (Tainted Observer is one).

When Tainted Observer 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. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
7. Saw — sacrifices a creature
8. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Total War — kills a creature

180 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 (Tainted Observer is one).

When Tainted Observer 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 (Tainted Observer is one).

When Tainted Observer 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 (Tainted Observer is one).

When Tainted Observer deals combat damage:

1. Locutus of Borg — makes a token
2. Antagonist Incorporator — makes a token

195 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 (Tainted Observer is one).

When Tainted Observer 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

301 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 (Tainted Observer is one).

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

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