Outbreak

anything leaves the battlefield — 1 card in the game can cause this (Outbreak is one).

1. Electro, Assaulting Battery — When Electro, Assaulting Battery leaves the battlefield thanks to Outbreak, it triggers
2. Chainer, Dementia Master — When Chainer, Dementia Master leaves the battlefield thanks to Outbreak, it exiles a Nightmare

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

When Outbreak 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

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

a creature in a graveyard — 2,769 cards in the game can cause this (Outbreak is one).

Outbreak puts cards into the graveyard that:

1. Havengul Lich — can bring back
2. Liliana the Repentant — can bring back
3. Paleoloth — can bring back
4. Chainer, Nightmare Adept — can bring back
5. Banon, the Returners' Leader — can bring back
6. Surgical Suite // Hospital Room — can bring back
7. Sword of Light and Shadow — can bring back
8. Necromantic Thirst — can bring back
9. Krile Baldesion — can bring back
10. Extus, Oriq Overlord // Awaken the Blood Avatar — can bring back

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

a nontoken creature dies — 2,769 cards in the game can cause this (Outbreak is one).

When a creature dies thanks to Outbreak:

1. Zahur, Glory's Past — makes a token
2. Vraska, the Silencer — brings a card back
3. Liesa, Forgotten Archangel — brings a card back
4. Avacyn, Angel of Horror — brings a card back
5. Yedora, Grave Gardener — brings a card back
6. Nim Deathmantle — brings a card back
7. Valkyrie's Call — brings a card back
8. Decaying Soil — brings a card back
9. High-Society Hunter — draws you 1 card
10. Overseer of the Damned — makes a token

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

a creature dies — 2,830 cards in the game can cause this (Outbreak is one).

1. Sangromancer — When a creature dies thanks to Outbreak, Sangromancer gains you 3 life
2. Pious Evangel // Wayward Disciple — When a creature dies thanks to Outbreak, Pious Evangel // Wayward Disciple makes each opponent lose 1 life
3. Daxos, Blessed by the Sun — When a creature dies thanks to Outbreak, Daxos, Blessed by the Sun gains you 1 life
4. Elas il-Kor, Sadistic Pilgrim — When a creature dies thanks to Outbreak, Elas il-Kor, Sadistic Pilgrim makes each opponent lose 1 life
5. Shriveling Rot — When a creature dies thanks to Outbreak, Shriveling Rot makes a player lose life equal to its toughness
6. Jeskai Sage — When Jeskai Sage dies thanks to Outbreak, it draws you 1 card
7. Meathook Massacre II — When a creature dies thanks to Outbreak, Meathook Massacre II brings a card back
8. Cyclops Superconductor — When Cyclops Superconductor dies thanks to Outbreak, it triggers
9. Saffi Eriksdotter — When a creature dies thanks to Outbreak, Saffi Eriksdotter sacrifices itself
10. Treacherous Vampire — When Treacherous Vampire dies thanks to Outbreak, it makes you lose life

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

a creature goes to a graveyard — 3,011 cards in the game can cause this (Outbreak is one).

1. Lorcan, Warlock Collector — When a creature hits the graveyard thanks to Outbreak, Lorcan, Warlock Collector brings a card back
2. Robot Domination — When a card hits the graveyard thanks to Outbreak, Robot Domination draws you 1 card
3. Lazav, Dimir Mastermind — When a creature hits the graveyard thanks to Outbreak, Lazav, Dimir Mastermind copies a permanent
4. Profane Memento — When a creature hits the graveyard thanks to Outbreak, Profane Memento gains you 1 life
5. Dennick, Pious Apprentice // Dennick, Pious Apparition — When a card hits the graveyard thanks to Outbreak, Dennick, Pious Apprentice // Dennick, Pious Apparition triggers
6. Soulcipher Board // Cipherbound Spirit — When a card hits the graveyard thanks to Outbreak, Soulcipher Board // Cipherbound Spirit triggers

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

a sorcery is cast — 3,720 cards in the game can cause this (Outbreak is one).

When Outbreak is cast:

1. Spellweaver Volute — copies a spell
2. Lilah, Undefeated Slickshot — gets +1/+1
3. Niblis of Frost — gets +1/+1

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

a permanent is put into a graveyard from the battlefield — 5,057 cards in the game can cause this (Outbreak is one).

1. Gerrard, Weatherlight Hero — When Gerrard, Weatherlight Hero dies thanks to Outbreak, it exiles itself

16 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 (Outbreak is one).

1. Repentant Vampire — Outbreak fills your graveyard toward the 7 or more cards Repentant Vampire needs
2. Athreos, Shroud-Veiled — Outbreak puts cards into the graveyard that Athreos, Shroud-Veiled can bring back
3. Gale, Waterdeep Prodigy — Outbreak puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
4. Harness the Storm — Outbreak puts cards into the graveyard that Harness the Storm can bring back

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