Clockwork Hydra

an artifact attacks — 1,243 cards in the game can cause this (Clockwork Hydra is one).

When Clockwork Hydra attacks:

1. Alibou, Ancient Witness — deals X damage
2. Bio-Asset Allocator — makes each opponent lose 1 life
3. Assaultron Dominator — puts a counter on a permanent
4. Aloy, Savior of Meridian — triggers

an artifact deals combat damage — 1,243 cards in the game can cause this (Clockwork Hydra is one).

When Clockwork Hydra deals combat damage:

1. Locutus of Borg — makes a token
2. Sharding Sphinx — makes a token
3. Antagonist Incorporator — makes a token
4. Research Thief — draws you 1 card
5. Thopter Spy Network — draws you 1 card
6. Hive Mind Coprocessor — makes you lose life
7. Pia Nalaar, Chief Mechanic — puts a counter on a permanent you control
8. Automated Assembly Line — triggers

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

a nontoken artifact deals combat damage — 1,243 cards in the game can cause this (Clockwork Hydra is one).

1. Virulent Silencer — When Clockwork Hydra deals combat damage, Virulent Silencer puts 2 counters on a permanent

a creature gets a counter — 2,691 cards in the game can cause this (Clockwork Hydra is one).

When Clockwork Hydra gets a counter:

1. Hollowmurk Siege — draws you 1 card
2. Ant-Man, Colony Commander — makes a token
3. Earth Kingdom General — gains you that much life
4. Casey Jones, Back Alley Brute — deals that much damage
5. Generous Patron — draws you 1 card
6. Shalai and Hallar — deals that much damage
7. Danny Pink — draws you 1 card
8. Enduring Scalelord — puts a +1/+1 counter on itself
9. Bold Plagiarist — puts counters on a permanent
10. Mikey & Leo, Chaos & Order — draws you 1 card

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

anything deals noncombat damage — 3,068 cards in the game can cause this (Clockwork Hydra is one).

When Clockwork Hydra deals noncombat damage:

1. Quest for Pure Flame — puts a quest counter on itself
2. Soul-Scar Mage — puts that many counters on a permanent
3. Fear of Burning Alive — deals that amount damage
4. Niv-Mizzet, Visionary — draws you that many cards
5. Ghyrson Starn, Kelermorph — deals 2 damage
6. Chandra's Incinerator — deals that much damage
7. Chandra's Pyreling — gets +1/+0
8. Talon of Pain — puts a charge counter on itself
9. Thor, Guardian of Midgard — exiles a card from your library
10. Virtue of Courage // Embereth Blaze — exiles a card from your library

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

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

When Clockwork Hydra 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 (Clockwork Hydra is one).

When Clockwork Hydra 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 (Clockwork Hydra is one).

When Clockwork Hydra 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

2 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 (Clockwork Hydra is one).

1. Anthem of Rakdos — When Clockwork Hydra attacks, Anthem of Rakdos gives +2/+0

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

a creature is cast — 18,010 cards in the game can cause this (Clockwork Hydra is one).

1. Primeval Bounty — When Clockwork Hydra is cast, Primeval Bounty makes a token

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