Ultron, Machine Overlord

a Robot it boosts — 42 cards in Ultron's colors can cause this (Ultron is one).

Ultron, Machine Overlord gives:

1. Barkform Harvester — bigger stats
2. Three Tree Mascot — bigger stats
3. Universal Automaton — bigger stats
4. Rooftop Percher — bigger stats
5. Changeling Wayfinder — bigger stats
6. Firdoch Core — bigger stats
7. Jocasta, Automaton Avenger — bigger stats

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

a Construct it boosts — 177 cards in Ultron's colors can cause this (Ultron is one).

1. The Peregrine Dynamo — Ultron, Machine Overlord gives The Peregrine Dynamo bigger stats

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

a nontoken artifact deals combat damage — 668 cards in Ultron's colors can cause this (Ultron is one).

1. Virulent Silencer — When Ultron, Machine Overlord deals combat damage, Virulent Silencer puts 2 counters on a permanent

an artifact is cast — 2,238 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord is cast:

1. Patchwork Automaton — puts a +1/+1 counter on itself
2. Golem Foundry — puts a charge counter on itself
3. Golem's Heart — gains you 1 life
4. Urza's Chalice — gains you 1 life
5. Solar Array — grants sunburst
6. Traxos, Scourge Eternal — untaps itself
7. Lux Artillery — grants sunburst

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

a nontoken artifact enters the battlefield — 2,243 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord enters:

1. Ultron, Artificial Malevolence — makes a token
2. Surge Conductor — proliferates
3. Mirrorworks — makes a token

an artifact enters the battlefield — 2,261 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord enters:

1. Arcbound Crusher — puts a +1/+1 counter on itself
2. Battered Golem — untaps itself
3. Grinding Station — untaps itself
4. Serum Tank — puts a charge counter on itself
5. Gonti's Aether Heart — puts 2 counters on a permanent
6. Tezzeret, Cruel Captain — puts a loyalty counter on itself

a creature attacks — 749 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord attacks:

1. Adaptive Omnitool — searches a library
2. Staff of Titania — makes a token
3. Inquisitorial Rosette — makes a token
4. Andúril, Flame of the West — makes 2 tokens
5. Moonsilver Spear — makes a token
6. Captain's Claws — makes a token
7. Sigiled Sword of Valeron — makes a token
8. Saw — sacrifices a creature
9. Ultima Weapon — kills a creature an opponent controls
10. Throwing Knife — sacrifices itself

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

anything attacks — 749 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Dawnsire, Sunstar Dreadnought — deals 100 damage
3. Twins of Discord — triggers
4. Cosmic Cube — triggers
5. Doom's Time Platform — exiles a card from your graveyard

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

a creature blocks — 749 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord blocks:

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

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

a creature is cast — 755 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord is cast:

1. Oketra's Monument — makes a token
2. Bontu's Monument — makes each opponent lose 1 life
3. Vanquisher's Banner — draws you 1 card
4. Rhonas's Monument — gives +2/+2
5. Hazoret's Monument — draws and discards
6. Kefnet's Monument — triggers

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

a nontoken creature enters the battlefield — 784 cards in Ultron's colors can cause this (Ultron is one).

1. Minion Reflector — When Ultron, Machine Overlord enters, Minion Reflector makes a token

a creature enters the battlefield — 905 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Machine Overlord enters:

1. Glaring Fleshraker — deals 1 damage
2. Blasting Station — untaps itself
3. Bloodline Pretender — puts a +1/+1 counter on itself
4. Soultether Golem — puts a time counter on itself
5. Symmetry Matrix — draws you 1 card
6. Monkey Cage — sacrifices itself
7. Eldrazi Mimic — triggers
8. Portcullis — flickers a creature
9. Decoction Module — puts a counter on a permanent you control
10. Ronin Warclub — triggers

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

anything that is not a token enters the battlefield — 2,691 cards in Ultron's colors can cause this (Ultron is one).

1. Canoptek Spyder — When Ultron, Machine Overlord enters, Canoptek Spyder draws you 1 card