Blood Clock

a nontoken permanent leaves the battlefield — 313 cards in the game can cause this (Blood Clock is one).

1. Genku, Future Shaper — When Blood Clock leaves the battlefield, Genku, Future Shaper makes a token

a permanent leaves the battlefield — 315 cards in the game can cause this (Blood Clock is one).

When Blood Clock leaves the battlefield:

1. Super Shredder — puts a +1/+1 counter on itself
2. Nefarious Imp — scries

life is lost — 3,160 cards in the game can cause this (Blood Clock is one).

When Blood Clock makes a player lose life:

1. Far Fortune, End Boss — raises your speed
2. Zahur, Glory's Past — raises your speed
3. Mendicant Core, Guidelight — raises your speed
4. Aether Syphon — raises your speed
5. Vnwxt, Verbose Host — raises your speed
6. Embalmed Ascendant — raises your speed
7. Slick Imitator — raises your speed
8. Oath of Lim-Dûl — sacrifices an enchantment
9. Marina Vendrell's Grimoire — triggers
10. Lich's Mastery — triggers

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

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

When Blood Clock is cast:

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

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 (Blood Clock is one).

When Blood Clock 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

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

When Blood Clock 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

57 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 (Blood Clock is one).

When Blood Clock enters:

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

38 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 (Blood Clock is one).

When Blood Clock 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.