Urza, Lord Protector

the other half of its meld pair — 1 card in the game can cause this (Urza is one).

1. The Mightstone and Weakstone — Urza, Lord Protector and The Mightstone and Weakstone meld together

a nontoken artifact is exiled — 334 cards in the game can cause this (Urza is one).

When an artifact is exiled thanks to Urza, Lord Protector:

1. Psychomancer — makes each opponent lose 1 life
2. Slagstone Refinery — makes a token

an artifact is exiled — 336 cards in the game can cause this (Urza is one).

1. Shard of the Void Dragon — When an artifact is exiled thanks to Urza, Lord Protector, Shard of the Void Dragon puts 2 +1/+1 counters on itself

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

an Artificer enters the battlefield — 342 cards in the game can cause this (Urza is one).

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

a planeswalker enters the battlefield — 366 cards in the game can cause this (Urza is one).

1. Liliana the Repentant — When Urza, Lord Protector enters, Liliana the Repentant mills a card
2. Liliana the Faultless — When Urza, Lord Protector enters, Liliana the Faultless gains you 1 life
3. Builder's Talent — When a planeswalker enters thanks to Urza, Lord Protector, Builder's Talent puts a counter on a creature
4. Brainstealer Dragon — When a planeswalker enters thanks to Urza, Lord Protector, Brainstealer Dragon makes a player lose life equal to its mana value
5. Cloudstone Curio — When a planeswalker enters thanks to Urza, Lord Protector, Cloudstone Curio triggers

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

1. Sludge Strider — When an artifact leaves the battlefield thanks to Urza, Lord Protector, Sludge Strider makes a player lose 1 life

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

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

1. The War Doctor — When an artifact is exiled thanks to Urza, Lord Protector, The War Doctor puts a time counter on itself

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

a Human enters the battlefield — 4,639 cards in the game can cause this (Urza is one).

When Urza, Lord Protector enters:

1. General Kudro of Drannith — hits a graveyard
2. Heronblade Elite — puts a +1/+1 counter on itself
3. Kyler, Sigardian Emissary — puts a +1/+1 counter on itself
4. Thalia's Lieutenant — puts a +1/+1 counter on itself
5. Champion of the Parish — puts a +1/+1 counter on itself
6. Captain of the Mists — untaps itself
7. Erkenbrand, Lord of Westfold — gives +1/+0
8. Beregond of the Guard — gives +1/+1
9. Théoden, King of Rohan — grants double strike
10. Lossarnach Captain — taps a creature an opponent controls

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

anything attacks — 17,934 cards in the game can cause this (Urza is one).

When Urza, Lord Protector attacks:

1. Shaun, Father of Synths — makes a token
2. Far Fortune, End Boss — deals 1 damage
3. Temmet, Naktamun's Will — draws you 1 card
4. Grim Javelineer — gives +1/+0
5. Invisible Woman — triggers
6. Caesar, Legion's Emperor — sacrifices a creature
7. Guide of Souls — triggers
8. Campsite Cuisine — sacrifices a Food
9. Gossip's Talent — triggers
10. Banon, the Returners' Leader — draws and discards

184 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 (Urza is one).

When Urza, Lord Protector attacks:

1. Adaptive Omnitool — searches a library
2. Anthem of Rakdos — gives +2/+0
3. Kindred Discovery — draws you 1 card
4. Invasion of New Capenna // Holy Frazzle-Cannon — puts counters on a permanent
5. Chorale of the Void — brings a card back
6. Anim Pakal, Thousandth Moon — puts a +1/+1 counter on itself
7. Saw — sacrifices a creature
8. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Total War — kills a creature

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

a creature blocks — 17,934 cards in the game can cause this (Urza is one).

When Urza, Lord Protector blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Tide of War — sacrifices a creature
4. Dead-Iron Sledge — kills a creature
5. Dwindle — kills a creature
6. Shield of the Righteous — triggers

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

a nontoken creature attacks — 17,934 cards in the game can cause this (Urza is one).

When Urza, Lord Protector attacks:

1. Mardu Ascendancy — makes a token
2. Basri Ket — makes a token
3. Militia's Pride — makes a token

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

1. God-Eternal Oketra — When Urza, Lord Protector is cast, God-Eternal Oketra makes a token

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

a creature enters the battlefield — 19,800 cards in the game can cause this (Urza is one).

When Urza, Lord Protector enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Gimli of the Glittering Caves — puts counters on a permanent
3. Ray Fillet, Wave Warrior — puts a counter on itself
4. Legolas Greenleaf — puts a counter on a permanent
5. The Neutrinos — gets +1/+0
6. Wingnut, Bat on the Belfry — grants flying, haste and menace
7. Aetherstorm Roc — puts a counter on a permanent you control
8. Raphael, Most Attitude — exiles a card from your library

659 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 (Urza is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Urza, Lord Protector enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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