Shriekhorn

a card is milled — 772 cards in the game can cause this (Shriekhorn is one).

1. Lo and Li, Royal Advisors — When Shriekhorn makes a player mill a card, Lo and Li, Royal Advisors puts a counter on an Advisor

an artifact is cast — 3,683 cards in the game can cause this (Shriekhorn is one).

When Shriekhorn is cast:

1. Mendicant Core, Guidelight — copies a spell
2. Sai, Master Thopterist — makes a token
3. Ravenous Robots — makes a token
4. Pinnacle Emissary — makes a token
5. Mirrodin Besieged — makes a token
6. Poetic Ingenuity — makes a token
7. Digsite Engineer — makes a token
8. Myrsmith — makes a token
9. Riddlesmith — draws you 1 card
10. Dr. Madison Li — puts a counter on a permanent you control

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

a nontoken artifact enters the battlefield — 3,768 cards in the game can cause this (Shriekhorn is one).

When Shriekhorn enters:

1. Ultron, Artificial Malevolence — makes a token
2. The Prydwen, Steel Flagship — makes a token
3. Conquest Mission — puts a quest counter on itself
4. Surge Conductor — proliferates
5. Replication Specialist — makes a token
6. Weapons Manufacturing — makes a token
7. Mirrorworks — makes a token

anything gets a counter — 4,415 cards in the game can cause this (Shriekhorn is one).

1. All Will Be One — When Shriekhorn gets a counter, All Will Be One deals that much damage

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

an artifact enters the battlefield — 4,643 cards in the game can cause this (Shriekhorn is one).

When Shriekhorn enters:

1. Transplant Theorist — draws you 1 card
2. Elvish Archivist — puts 2 +1/+1 counters on itself
3. Golbez, Crystal Collector — surveils
4. Sludge Strider — makes a player lose 1 life
5. Underhanded Designs — makes each opponent lose 1 life
6. Mechan Assembler — makes a token
7. Glassdust Hulk — gets +1/+1
8. Rook Turret — draws you 1 card
9. Hedron Detonator — deals 1 damage
10. Pactdoll Terror — makes each opponent lose 1 life

56 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 (Shriekhorn is one).

1. Vessel of Endless Rest — Shriekhorn puts cards into the graveyard that Vessel of Endless Rest can bring back
2. Samwise Gamgee — Shriekhorn puts cards into the graveyard that Samwise Gamgee can bring back
3. Fire Nation Salvagers — Shriekhorn puts cards into the graveyard that Fire Nation Salvagers can bring back
4. Bloodbond March — Shriekhorn puts cards into the graveyard that Bloodbond March can bring back
5. Gale, Waterdeep Prodigy — Shriekhorn puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
6. Harness the Storm — Shriekhorn puts cards into the graveyard that Harness the Storm can bring back
7. Heart-Shaped Herb — Shriekhorn puts cards into the graveyard that Heart-Shaped Herb can bring back
8. Wayward Angel — Shriekhorn fills your graveyard toward the 7 or more cards Wayward Angel needs
9. Rescue from the Underworld — Shriekhorn puts cards into the graveyard that Rescue from the Underworld can bring back
10. Victimize — Shriekhorn 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 (Shriekhorn is one).

When a card hits the graveyard thanks to Shriekhorn:

1. The Haunt of Hightower — puts a +1/+1 counter on itself
2. Duskmantle Guildmage — makes each opponent lose 1 life
3. Vulturous Zombie — puts a +1/+1 counter on itself
4. Quest for Ancient Secrets — puts a quest counter on itself
5. Bloodchief Ascension — makes each opponent lose 2 life
6. Compost — draws you 1 card
7. Planar Void — hits a graveyard
8. Measure of Wickedness — gives an opponent control of itself
9. Energy Field — sacrifices itself

2 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 (Shriekhorn is one).

When Shriekhorn enters:

1. HYDRA Assault Robot — deals 1 damage
2. Era of Innovation — puts a counter on a permanent you control

55 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 (Shriekhorn is one).

When Shriekhorn is cast:

1. Sokka, Bold Boomeranger — puts a +1/+1 counter on itself
2. Saheeli, Radiant Creator — puts a counter on a permanent you control

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