Ultron, Unlimited

a Villain enters the battlefield — 150 cards in Ultron's colors can cause this (Ultron is one).

When a Villain enters thanks to Ultron, Unlimited:

1. Flying Octobot — puts a +1/+1 counter on itself
2. Doom Reigns Supreme — makes each opponent lose 1 life
3. Crossbones, Malicious Mercenary — puts a +1/+1 counter on itself
4. Yellowjacket, Heartless Marauder — gets +1/+0
5. Swordsman, Sharp Scoundrel — triggers
6. Prowler, Clawed Thief — draws and discards
7. Baron Strucker, HYDRA Overlord — draws and discards

an artifact deals combat damage — 915 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited deals combat damage:

1. Sharding Sphinx — makes a token
2. Research Thief — draws you 1 card
3. Thopter Spy Network — draws you 1 card
4. Hive Mind Coprocessor — makes you lose life

an artifact attacks — 915 cards in Ultron's colors can cause this (Ultron is one).

1. Bio-Asset Allocator — When Ultron, Unlimited attacks, Bio-Asset Allocator makes each opponent lose 1 life

a nontoken artifact deals combat damage — 915 cards in Ultron's colors can cause this (Ultron is one).

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

an artifact goes to a graveyard — 480 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited hits the graveyard:

1. Ultron the Annihilator — makes each opponent lose 1 life
2. Ultron's Auxiliary — puts a +1/+1 counter on itself

a card is discarded — 1,106 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited makes a player discard a card:

1. Containment Construct — brings a card back
2. Moonstone, Harsh Mistress — brings a card back
3. Sangromancer — gains you 3 life
4. Lo and Li, Royal Advisors — puts a counter on an Advisor
5. Lazotep Chancellor — puts 2 counters on a Zombie or Army
6. Scrounging Skyray — puts that many +1/+1 counters on itself
7. Archfiend of Ifnir — puts a counter on a creature
8. Tourach, Dread Cantor — puts a +1/+1 counter on itself
9. Currency Converter — exiles it
10. Hostile Investigator — triggers

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

provide a creature to sacrifice — 805 cards in Ultron's colors can cause this.

1. Jalira, Master Polymorphist — Ultron, Unlimited makes fodder for Jalira, Master Polymorphist
2. Polymorph — Ultron, Unlimited makes fodder for Polymorph
3. Proteus Staff — Ultron, Unlimited makes fodder for Proteus Staff
4. Synthetic Destiny — Ultron, Unlimited makes fodder for Synthetic Destiny
5. Mass Polymorph — Ultron, Unlimited makes fodder for Mass Polymorph

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

a creature goes to a graveyard — 1,550 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited hits the graveyard:

1. Lorcan, Warlock Collector — brings a card back
2. Syr Konrad, the Grim — deals 1 damage
3. Robot Domination — draws you 1 card
4. Lazav, Dimir Mastermind — copies a permanent
5. Profane Memento — gains you 1 life
6. Soulcipher Board // Cipherbound Spirit — triggers

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

an artifact is cast — 2,777 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited is cast:

1. Sai, Master Thopterist — makes a token
2. Mirrodin Besieged — makes a token
3. Riddlesmith — draws you 1 card
4. Patchwork Automaton — puts a +1/+1 counter on itself
5. Iron Man, Bleeding Edge — copies a spell
6. Golem Foundry — puts a charge counter on itself
7. Efficient Construction — makes a token
8. Vedalken Archmage — draws you 1 card
9. Biotransference — makes you lose life
10. Forensic Gadgeteer — triggers

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

a token enters the battlefield — 1,135 cards in Ultron's colors can cause this (Ultron is one).

When a Robot or Villain enters thanks to Ultron, Unlimited:

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 — 1,136 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited makes a Robot or Villain token:

1. Idol of Oblivion — draws you 1 card
2. Mirkwood Bats — makes each opponent lose 1 life

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

a nontoken artifact enters the battlefield — 2,783 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited enters:

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

a card is drawn — 2,047 cards in Ultron's colors can cause this (Ultron is one).

When Ultron, Unlimited makes a player draw a card:

1. Aether Syphon — mills a card
2. Ob Nixilis, the Hate-Twisted — deals 1 damage
3. Starving Revenant — makes each opponent lose 1 life
4. Diviner's Wand — gets +1/+1
5. Ominous Seas — puts a foreshadow counter on itself
6. Orcish Bowmasters — deals 1 damage
7. Scrawling Crawler — makes each opponent lose 1 life
8. Iron Man, Armored Avenger — puts a counter on a creature
9. Psychosis Crawler — makes each opponent lose 1 life
10. Lyla, Holographic Assistant — puts a counter on a creature

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

a creature enters the battlefield — 6,953 cards in Ultron's colors can cause this (Ultron is one).

1. Pollywog Prodigy — When Ultron, Unlimited enters, Pollywog Prodigy puts a counter on itself

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