Urza, Lord High Artificer

an Artificer enters the battlefield — 82 cards in Urza's colors can cause this (Urza is one).

1. Inventor's Goggles — When Urza, Lord High Artificer enters, Inventor's Goggles triggers

provide a creature to sacrifice — 424 cards in Urza's colors can cause this.

1. Jalira, Master Polymorphist — Urza, Lord High Artificer makes fodder for Jalira, Master Polymorphist
2. Polymorph — Urza, Lord High Artificer makes fodder for Polymorph
3. Proteus Staff — Urza, Lord High Artificer makes fodder for Proteus Staff
4. Synthetic Destiny — Urza, Lord High Artificer makes fodder for Synthetic Destiny
5. Mass Polymorph — Urza, Lord High Artificer makes fodder for Mass Polymorph

419 other cards cause it too. These are the ones with the most connections.

a token enters the battlefield — 614 cards in Urza's colors can cause this (Urza is one).

When a Construct enters thanks to Urza, Lord High Artificer:

1. Mister Fantastic, Reed Richards — draws you 1 card
2. Junk Winder — taps a creature, artifact, enchantment, planeswalker or battle an opponent controls

a token is created — 615 cards in Urza's colors can cause this (Urza is one).

1. Idol of Oblivion — When Urza, Lord High Artificer makes a Construct token, Idol of Oblivion draws you 1 card

1 other card cares about it too. These are the ones with the most connections.

a Human enters the battlefield — 634 cards in Urza's colors can cause this (Urza is one).

1. Captain of the Mists — When Urza, Lord High Artificer enters, Captain of the Mists untaps itself

an artifact enters the battlefield — 2,644 cards in Urza's colors can cause this (Urza is one).

When a Construct enters thanks to Urza, Lord High Artificer:

1. Transplant Theorist — draws you 1 card
2. Mechan Assembler — makes a token
3. Rook Turret — draws you 1 card
4. Skyswimmer Koi — draws you 1 card
5. Kappa Cannoneer — puts a +1/+1 counter on itself
6. Arcbound Crusher — puts a +1/+1 counter on itself
7. Battered Golem — untaps itself
8. Grinding Station — untaps itself
9. Donatello, Way with Machines — puts a +1/+1 counter on itself
10. Lumengrid Sentinel — taps a permanent

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

a creature attacks — 3,238 cards in Urza's colors can cause this (Urza is one).

When Urza, Lord High Artificer attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. Screaming Swarm — mills a card
4. Imperious Mindbreaker — mills a card
5. Staff of Titania — makes a token
6. Inquisitorial Rosette — makes a token
7. Andúril, Flame of the West — makes 2 tokens
8. Saw — sacrifices a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

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

anything attacks — 3,238 cards in Urza's colors can cause this (Urza is one).

When Urza, Lord High Artificer attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Madame Web, Clairvoyant — mills a card
3. Dawnsire, Sunstar Dreadnought — deals 100 damage
4. Curse of Verbosity — draws you 1 card
5. Gossip's Talent — triggers
6. Alora, Merry Thief — triggers
7. Twins of Discord — triggers
8. Great Gilded Boat — draws and discards
9. Cosmic Cube — triggers
10. Doom's Time Platform — exiles a card from your graveyard

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

a creature blocks — 3,238 cards in Urza's colors can cause this (Urza is one).

When Urza, Lord High Artificer blocks:

1. Barrow-Blade — strips abilities
2. Dead-Iron Sledge — kills a creature
3. Dwindle — kills a creature

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

a creature is cast — 3,254 cards in Urza's colors can cause this (Urza is one).

When Urza, Lord High Artificer is cast:

1. Oketra's Monument — makes a token
2. Kozilek's Unsealing — makes 2 tokens
3. The Clone Saga — copies a spell
4. Customs Depot — draws you 1 card
5. Bontu's Monument — makes each opponent lose 1 life
6. Vanquisher's Banner — draws you 1 card
7. Rhonas's Monument — gives +2/+2
8. Hazoret's Monument — draws and discards
9. Aether Barrier — makes a player sacrifice a permanent
10. Kefnet's Monument — triggers

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

a nontoken creature enters the battlefield — 3,316 cards in Urza's colors can cause this (Urza is one).

When Urza, Lord High Artificer enters:

1. Arni, Humble Scribe — untaps itself
2. Minion Reflector — makes a token
3. Overburden — triggers

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

a creature enters the battlefield — 3,581 cards in Urza's colors can cause this (Urza is one).

1. Ray Fillet, Wave Warrior — When Urza, Lord High Artificer enters, Ray Fillet, Wave Warrior puts a counter on itself
2. Pollywog Prodigy — When Urza, Lord High Artificer enters, Pollywog Prodigy puts a counter on itself
3. Glaring Fleshraker — When a Construct enters thanks to Urza, Lord High Artificer, Glaring Fleshraker deals 1 damage
4. Blasting Station — When a Construct enters thanks to Urza, Lord High Artificer, Blasting Station untaps itself
5. Sage of the Falls — When a Construct enters thanks to Urza, Lord High Artificer, Sage of the Falls draws you 1 card
6. Bloodline Pretender — When a Construct enters thanks to Urza, Lord High Artificer, Bloodline Pretender puts a +1/+1 counter on itself
7. Sage's Row Denizen — When Urza, Lord High Artificer enters, Sage's Row Denizen mills a card
8. Soultether Golem — When a Construct enters thanks to Urza, Lord High Artificer, Soultether Golem puts a time counter on itself
9. Monkey Cage — When a Construct enters thanks to Urza, Lord High Artificer, Monkey Cage sacrifices itself

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