Rex, Cyber-Hound

a creature is exiled — 508 cards in Rex's colors can cause this (Rex is one).

1. Soulherder — When a creature is exiled thanks to Rex, Cyber-Hound, Soulherder puts a +1/+1 counter on itself

an artifact deals combat damage — 898 cards in Rex's colors can cause this (Rex is one).

When Rex, Cyber-Hound deals combat damage:

1. Sharding Sphinx — makes a token
2. Antagonist Incorporator — makes a token
3. Research Thief — draws you 1 card
4. Thopter Spy Network — draws you 1 card
5. Automated Assembly Line — triggers

a nontoken artifact deals combat damage — 898 cards in Rex's colors can cause this (Rex is one).

1. Virulent Silencer — When Rex, Cyber-Hound deals combat damage, Virulent Silencer puts 2 counters on a permanent

an artifact is cast — 2,792 cards in Rex's colors can cause this (Rex is one).

When Rex, Cyber-Hound is cast:

1. Mendicant Core, Guidelight — copies a spell
2. Sai, Master Thopterist — makes a token
3. Mirrodin Besieged — makes a token
4. Digsite Engineer — makes a token
5. Myrsmith — makes a token
6. Riddlesmith — draws you 1 card
7. Patchwork Automaton — puts a +1/+1 counter on itself
8. Iron Man, Bleeding Edge — copies a spell
9. Golem Foundry — puts a charge counter on itself
10. Efficient Construction — makes a token

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

a nontoken artifact enters the battlefield — 2,858 cards in Rex's colors can cause this (Rex is one).

When Rex, Cyber-Hound 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
6. Mirrorworks — makes a token

anything gets a counter — 1,563 cards in Rex's colors can cause this (Rex is one).

1. Fabrication Module — When a permanent gets a counter thanks to Rex, Cyber-Hound, Fabrication Module puts a counter on a creature

an artifact enters the battlefield — 3,114 cards in Rex's colors can cause this (Rex is one).

When Rex, Cyber-Hound enters:

1. Transplant Theorist — draws you 1 card
2. Mechan Assembler — makes a token
3. Glassdust Hulk — gets +1/+1
4. Rook Turret — draws you 1 card
5. Mandible Justiciar — gets +1/+1
6. Skyswimmer Koi — draws you 1 card
7. Kappa Cannoneer — puts a +1/+1 counter on itself
8. Simulacrum Synthesizer — makes a token
9. Arcbound Crusher — puts a +1/+1 counter on itself
10. Battered Golem — untaps itself

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

a card in a graveyard — 2,488 cards in Rex's colors can cause this (Rex is one).

1. Vessel of Endless Rest — Rex, Cyber-Hound puts cards into the graveyard that Vessel of Endless Rest can bring back
2. Gale, Waterdeep Prodigy — Rex, Cyber-Hound puts cards into the graveyard that Gale, Waterdeep Prodigy can bring back
3. Heart-Shaped Herb — Rex, Cyber-Hound puts cards into the graveyard that Heart-Shaped Herb can bring back
4. Wayward Angel — Rex, Cyber-Hound fills your graveyard toward the 7 or more cards Wayward Angel needs
5. Enlightened Confidant — Rex, Cyber-Hound puts cards into the graveyard that Enlightened Confidant can bring back
6. Mindwhisker — Rex, Cyber-Hound fills your graveyard toward the 7 or more cards Mindwhisker needs
7. Spurnmage Advocate — Rex, Cyber-Hound puts cards into the graveyard that Spurnmage Advocate can bring back
8. Barkform Harvester — Rex, Cyber-Hound puts cards into the graveyard that Barkform Harvester can bring back
9. Cybernetic Specialist — Rex, Cyber-Hound puts cards into the graveyard that Cybernetic Specialist can bring back
10. Kirtar's Wrath — Rex, Cyber-Hound fills your graveyard toward the 7 or more cards Kirtar's Wrath needs

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

anything goes to a graveyard — 2,488 cards in Rex's colors can cause this (Rex is one).

When a card hits the graveyard thanks to Rex, Cyber-Hound:

1. Quest for Ancient Secrets — puts a quest counter on itself
2. Energy Field — sacrifices itself

a creature attacks — 6,349 cards in Rex's colors can cause this (Rex is one).

When Rex, Cyber-Hound attacks:

1. Adaptive Omnitool — searches a library
2. Kindred Discovery — draws you 1 card
3. Saw — sacrifices a creature
4. Ultima Weapon — kills a creature an opponent controls

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

anything attacks — 6,349 cards in Rex's colors can cause this (Rex is one).

When Rex, Cyber-Hound attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Surgical Suite // Hospital Room — puts a counter on a creature
3. Guide of Souls — triggers
4. Gossip's Talent — triggers

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

a creature blocks — 6,349 cards in Rex's colors can cause this (Rex is one).

1. Dead-Iron Sledge — When Rex, Cyber-Hound blocks, Dead-Iron Sledge kills a creature

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

a creature is cast — 6,370 cards in Rex's colors can cause this (Rex is one).

1. God-Eternal Oketra — When Rex, Cyber-Hound is cast, God-Eternal Oketra makes a token

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

a creature enters the battlefield — 7,093 cards in Rex's colors can cause this (Rex is one).

When Rex, Cyber-Hound enters:

1. Pollywog Prodigy — puts a counter on itself
2. Ray Fillet, Wave Warrior — puts a counter on itself
3. Aetherstorm Roc — puts a counter on a permanent you control

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

anything enters the battlefield — 10,721 cards in Rex's colors can cause this (Rex is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Rex, Cyber-Hound enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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