Instigator

a card is discarded — 2,042 cards in the game can cause this (Instigator is one).

When Instigator makes a player discard a card:

1. Ivora, Insatiable Heir — puts a +1/+1 counter on itself
2. Cool but Rude — deals 2 damage
3. Containment Construct — brings a card back
4. Moonstone, Harsh Mistress — brings a card back
5. Lazotep Chancellor — puts 2 counters on a Zombie or Army
6. Magmakin Artillerist — deals that much damage
7. Inti, Seneschal of the Sun — exiles a card from your library
8. Pitchstone Wall — sacrifices itself
9. Currency Converter — exiles it
10. Hostile Investigator — triggers

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

a Human enters the battlefield — 4,639 cards in the game can cause this (Instigator is one).

When Instigator enters:

1. General Kudro of Drannith — hits a graveyard
2. Heronblade Elite — puts a +1/+1 counter on itself
3. Kyler, Sigardian Emissary — puts a +1/+1 counter on itself
4. Thalia's Lieutenant — puts a +1/+1 counter on itself
5. Champion of the Parish — puts a +1/+1 counter on itself
6. Captain of the Mists — untaps itself
7. Erkenbrand, Lord of Westfold — gives +1/+0
8. Beregond of the Guard — gives +1/+1
9. Théoden, King of Rohan — grants double strike
10. Lossarnach Captain — taps a creature an opponent controls

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

a card in a graveyard — 7,589 cards in the game can cause this (Instigator is one).

1. Samwise Gamgee — Instigator puts cards into the graveyard that Samwise Gamgee can bring back
2. Bloodbond March — Instigator puts cards into the graveyard that Bloodbond March can bring back
3. Thor, God of Thunder — Instigator puts cards into the graveyard that Thor, God of Thunder can bring back
4. Gale, Waterdeep Prodigy — Instigator puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
5. Harness the Storm — Instigator puts cards into the graveyard that Harness the Storm can bring back
6. Transplant Theorist — Instigator puts cards into the graveyard that Transplant Theorist can bring back
7. Heart-Shaped Herb — Instigator puts cards into the graveyard that Heart-Shaped Herb can bring back
8. Wayward Angel — Instigator fills your graveyard toward the 7 or more cards Wayward Angel needs
9. Rescue from the Underworld — Instigator puts cards into the graveyard that Rescue from the Underworld can bring back
10. Victimize — Instigator puts cards into the graveyard that Victimize can bring back

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

anything goes to a graveyard — 7,589 cards in the game can cause this (Instigator is one).

When a card hits the graveyard thanks to Instigator:

1. Quest for Ancient Secrets — puts a quest counter on itself
2. Planar Void — hits a graveyard
3. Measure of Wickedness — gives an opponent control of itself
4. Energy Field — sacrifices itself

7 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 (Instigator is one).

When Instigator 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

117 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 (Instigator is one).

When Instigator 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

193 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 (Instigator is one).

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

29 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 (Instigator is one).

When Instigator enters:

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

346 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 (Instigator is one).

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

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