Contagion

anything is exiled — 2,497 cards in the game can cause this (Contagion is one).

1. The War Doctor — When a permanent is exiled thanks to Contagion, The War Doctor puts a time counter on itself

a creature gets a counter — 2,691 cards in the game can cause this (Contagion is one).

When a creature gets a counter thanks to Contagion:

1. Hollowmurk Siege — draws you 1 card
2. Wickersmith's Tools — puts a charge counter on itself
3. Hapatra, Vizier of Poisons — makes a token
4. Ant-Man, Colony Commander — makes a token
5. Flourishing Defenses — makes a token
6. Nest of Scarabs — makes that many tokens
7. Earth Kingdom General — gains you that much life
8. Obelisk Spider — makes each opponent lose 1 life
9. Auntie Ool, Cursewretch — draws you 1 card
10. Casey Jones, Back Alley Brute — deals that much damage

31 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 (Contagion is one).

When Contagion makes a player lose life:

1. The Master of Lake-town — mills a card
2. Intermediate Chirography — puts a counter on a creature
3. Vilis, Broker of Blood — draws you that many cards
4. Vengeful Warchief — puts a +1/+1 counter on itself
5. Wax-Wane Witness — gets +1/+0
6. Oath of Lim-Dûl — sacrifices an enchantment
7. Marina Vendrell's Grimoire — triggers
8. Lich's Mastery — triggers
9. Lich's Tomb — sacrifices a permanent
10. Gonti's Machinations — puts a counter on a permanent you control

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

an instant is cast — 3,931 cards in the game can cause this (Contagion is one).

When Contagion is cast:

1. Lunar Mystic — draws you 1 card
2. Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time — grants rebound
3. Repeated Reverberation — copies an ability
4. Bill Potts — copies an ability
5. Riku of Two Reflections — copies a spell
6. Sword of Wealth and Power — copies a spell
7. Lilah, Undefeated Slickshot — gets +1/+1
8. Gale, Waterdeep Prodigy — brings a card back
9. In the Eye of Chaos — counters a spell
10. Niblis of Frost — taps a creature an opponent controls

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

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

1. All Will Be One — When a creature gets a counter thanks to Contagion, All Will Be One deals that much damage

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

anything is cast — 31,128 cards in the game can cause this (Contagion is one).

When Contagion is cast:

1. Windrider Wizard — draws you 1 card
2. Relic Amulet — puts a charge counter on itself
3. Rockslide Sorcerer — deals 1 damage
4. Umara Wizard // Umara Skyfalls — grants flying
5. Alania, Divergent Storm — makes an opponent draw 1 card
6. Umara Mystic — gets +2/+0
7. Master of Winds — triggers

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