Olivia's Dragoon

a Berserker attacks — 214 cards in the game can cause this (Olivia's Dragoon is one).

1. The Bloodsky Massacre — When Olivia's Dragoon attacks, The Bloodsky Massacre draws you 1 card

a Vampire attacks — 484 cards in the game can cause this (Olivia's Dragoon is one).

When Olivia's Dragoon attacks:

1. Glass-Cast Heart — makes a token
2. Sanctum Seeker — makes each opponent lose 1 life

a nontoken Vampire attacks — 484 cards in the game can cause this (Olivia's Dragoon is one).

1. Mavren Fein, Dusk Apostle — When Olivia's Dragoon attacks, Mavren Fein, Dusk Apostle makes a token

a Vampire creature is cast — 484 cards in the game can cause this (Olivia's Dragoon is one).

1. Bloodlord of Vaasgoth — When Olivia's Dragoon is cast, Bloodlord of Vaasgoth grants bloodthirst

a Vampire deals combat damage — 484 cards in the game can cause this (Olivia's Dragoon is one).

When Olivia's Dragoon deals combat damage:

1. Rakish Heir — puts a counter on a permanent
2. Stensia Masquerade — puts a counter on a permanent

a Vampire enters the battlefield — 500 cards in the game can cause this (Olivia's Dragoon is one).

When Olivia's Dragoon enters:

1. Anje, Maid of Dishonor — makes a token
2. Forerunner of the Legion — gives +1/+1
3. Markov Enforcer — deals damage
4. Evelyn, the Covetous — exiles a card from a library

a card is discarded — 2,042 cards in the game can cause this (Olivia's Dragoon is one).

When Olivia's Dragoon 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 card in a graveyard — 7,589 cards in the game can cause this (Olivia's Dragoon is one).

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

When a card hits the graveyard thanks to Olivia's Dragoon:

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 (Olivia's Dragoon is one).

When Olivia's Dragoon 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 (Olivia's Dragoon is one).

When Olivia's Dragoon 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

192 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 (Olivia's Dragoon is one).

1. Tide of War — When Olivia's Dragoon 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 (Olivia's Dragoon is one).

When Olivia's Dragoon 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

351 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 (Olivia's Dragoon is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Olivia's Dragoon enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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