The Stone Brain

a library is searched — 982 cards in the game can cause this (The Stone Brain is one).

When a permanent searches a library thanks to The Stone Brain:

1. River Song — puts a +1/+1 counter on itself
2. Archivist of Oghma — gains you 1 life
3. Wan Shi Tong, Librarian — puts a +1/+1 counter on itself
4. Ob Nixilis, Unshackled — makes an opponent sacrifice a creature

an artifact leaves the battlefield — 1,680 cards in the game can cause this (The Stone Brain is one).

1. Sludge Strider — When The Stone Brain leaves the battlefield, Sludge Strider makes a player lose 1 life

anything is exiled — 2,497 cards in the game can cause this (The Stone Brain is one).

1. The War Doctor — When The Stone Brain is exiled, The War Doctor puts a time counter on itself

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

When The Stone Brain 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 (The Stone Brain is one).

When The Stone Brain 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

a card is drawn — 3,815 cards in the game can cause this (The Stone Brain is one).

When a permanent makes a player draw a card thanks to The Stone Brain:

1. Ob Nixilis, the Hate-Twisted — deals 1 damage
2. Orcish Bowmasters — deals 1 damage
3. Scrawling Crawler — makes each opponent lose 1 life
4. Xyris, the Writhing Storm — makes a token
5. Fate Unraveler — deals 1 damage
6. Sheoldred, the Apocalypse — makes a player lose 2 life
7. Nekusar, the Mindrazer — deals 1 damage
8. Leela, Sevateem Warrior — puts a +1/+1 counter on itself
9. Razorkin Needlehead — deals 1 damage
10. Consecrated Sphinx — draws you 2 cards

57 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 (The Stone Brain is one).

When The Stone Brain enters:

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

55 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 (The Stone Brain is one).

When The Stone Brain enters:

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

41 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 (The Stone Brain is one).

When The Stone Brain 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.