Plague Fiend

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

1. Shaun, Father of Synths — When Shaun, Father of Synths leaves the battlefield thanks to Plague Fiend, it exiles a Synth you control
2. Chainer, Dementia Master — When Chainer, Dementia Master leaves the battlefield thanks to Plague Fiend, it exiles a Nightmare

an Insect attacks — 323 cards in the game can cause this (Plague Fiend is one).

When Plague Fiend attacks:

1. Vrestin, Menoptra Leader — puts a counter on a permanent
2. Fumulus, the Infestation — makes each opponent lose 1 life

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

Plague Fiend 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 (Plague Fiend is one).

When Plague Fiend dies:

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 (Plague Fiend is one).

1. Pious Evangel // Wayward Disciple — When Plague Fiend dies, Pious Evangel // Wayward Disciple makes each opponent lose 1 life
2. Daxos, Blessed by the Sun — When Plague Fiend dies, Daxos, Blessed by the Sun gains you 1 life
3. Elas il-Kor, Sadistic Pilgrim — When Plague Fiend dies, Elas il-Kor, Sadistic Pilgrim makes each opponent lose 1 life
4. Shriveling Rot — When Plague Fiend dies, Shriveling Rot makes a player lose life equal to its toughness
5. Boss's Chauffeur — When Boss's Chauffeur dies thanks to Plague Fiend, it makes a token
6. Clavileño, First of the Blessed — When Clavileño, First of the Blessed dies thanks to Plague Fiend, it draws you 1 card
7. Quirion Beastcaller — When Quirion Beastcaller dies thanks to Plague Fiend, it puts +1/+1 counters on itself
8. Dinosaur Egg — When Dinosaur Egg dies thanks to Plague Fiend, it triggers
9. Saffi Eriksdotter — When Plague Fiend dies, Saffi Eriksdotter sacrifices itself
10. Treacherous Vampire — When Treacherous Vampire dies thanks to Plague Fiend, it makes you lose life

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

a creature leaves the battlefield — 4,238 cards in the game can cause this (Plague Fiend is one).

1. Ninja Teen — When Plague Fiend leaves the battlefield, Ninja Teen makes each opponent lose 1 life

33 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 (Plague Fiend is one).

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

18 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 (Plague Fiend is one).

1. Havi, the All-Father — Plague Fiend fills your graveyard toward the 4 or more cards Havi, the All-Father needs
2. Repentant Vampire — Plague Fiend fills your graveyard toward the 7 or more cards Repentant Vampire needs
3. Athreos, Shroud-Veiled — Plague Fiend puts cards into the graveyard that Athreos, Shroud-Veiled can bring back

441 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 (Plague Fiend is one).

1. Chorale of the Void — When Plague Fiend attacks, Chorale of the Void brings a card back

219 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 (Plague Fiend is one).

1. Grim Javelineer — When Plague Fiend attacks, Grim Javelineer gives +1/+0

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