Scar

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

When a creature gets a counter thanks to Scar:

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. Flourishing Defenses — makes a token
5. Nest of Scarabs — makes that many tokens
6. Obelisk Spider — makes each opponent lose 1 life
7. Auntie Ool, Cursewretch — draws you 1 card
8. Generous Patron — draws you 1 card
9. Danny Pink — draws you 1 card
10. Bold Plagiarist — puts counters on a permanent

31 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 (Scar is one).

1. Lunar Mystic — When Scar is cast, Lunar Mystic draws you 1 card
2. Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time — When Scar is cast, Ojer Pakpatiq, Deepest Epoch // Temple of Cyclical Time grants rebound
3. Repeated Reverberation — When Scar is cast, Repeated Reverberation copies an ability
4. Riku of Two Reflections — When Scar is cast, Riku of Two Reflections copies a spell
5. Sword of Wealth and Power — When Scar is cast, Sword of Wealth and Power copies a spell
6. Gale, Waterdeep Prodigy — When Scar is cast, Gale, Waterdeep Prodigy brings a card back
7. Harness the Storm — When Scar is cast, Harness the Storm brings a card back
8. In the Eye of Chaos — When Scar is cast, In the Eye of Chaos counters a spell
9. Lilah, Undefeated Slickshot — When Scar is cast, Lilah, Undefeated Slickshot exiles a spell you control
10. Niblis of Frost — When Scar is cast, 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 (Scar is one).

1. All Will Be One — When a creature gets a counter thanks to Scar, 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 (Scar is one).

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

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