Activated Sleeper

a Phyrexian attacks — 495 cards in the game can cause this (Activated Sleeper is one).

1. Vulpine Harvester — When Activated Sleeper attacks, Vulpine Harvester brings a card back

a nontoken Phyrexian enters the battlefield — 496 cards in the game can cause this (Activated Sleeper is one).

1. Darksteel Splicer — When Activated Sleeper enters, Darksteel Splicer makes a token

a Phyrexian enters the battlefield — 524 cards in the game can cause this (Activated Sleeper is one).

1. Essence of Orthodoxy — When Activated Sleeper enters, Essence of Orthodoxy puts a counter on a permanent

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

When Activated Sleeper attacks:

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

111 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 (Activated Sleeper is one).

When Activated Sleeper 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

180 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 (Activated Sleeper is one).

When Activated Sleeper blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Carnage Gladiator — makes a player lose 1 life
3. Barrow-Blade — strips abilities
4. Heat of Battle — deals 1 damage
5. Battle Strain — deals 1 damage
6. Favor of the Woods — gains you 3 life
7. Tide of War — sacrifices a creature
8. Dead-Iron Sledge — kills a creature
9. Dwindle — kills a creature
10. Shield of the Righteous — triggers

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

a creature deals combat damage — 17,934 cards in the game can cause this (Activated Sleeper is one).

When Activated Sleeper deals combat damage:

1. Primo, the Unbounded — makes a token
2. Locutus of Borg — makes a token
3. Antagonist Incorporator — makes a token
4. Hive Mind Coprocessor — makes you lose life

193 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 (Activated Sleeper is one).

When Activated Sleeper attacks:

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

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

1. Fire Nation Salvagers — When Fire Nation Salvagers enters because Activated Sleeper copies it, its ability triggers again
2. Goblin Goliath — When Goblin Goliath enters because Activated Sleeper copies it, its ability triggers again
3. Slash, Reptile Rampager — When Activated Sleeper enters, Slash, Reptile Rampager deals 2 damage
4. The Neutrinos — When Activated Sleeper enters, The Neutrinos gets +1/+0
5. Wingnut, Bat on the Belfry — When Activated Sleeper enters, Wingnut, Bat on the Belfry grants flying, haste and menace
6. Shadow Puppeteers — When Shadow Puppeteers enters because Activated Sleeper copies it, its ability triggers again
7. Tenured Inkcaster — When Tenured Inkcaster enters because Activated Sleeper copies it, its ability triggers again
8. Aetherstorm Roc — When Aetherstorm Roc enters because Activated Sleeper copies it, its ability triggers again
9. Raphael, Most Attitude — When Activated Sleeper enters, Raphael, Most Attitude exiles a card from your library
10. Clandestine Meddler — When Clandestine Meddler enters because Activated Sleeper copies it, its ability triggers again

297 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 (Activated Sleeper is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Activated Sleeper enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself
2. Ivora, Insatiable Heir — When Ivora, Insatiable Heir enters because Activated Sleeper copies it, its ability triggers again
3. Dogmeat, Ever Loyal — When Dogmeat, Ever Loyal enters because Activated Sleeper copies it, its ability triggers again
4. The Earth King — When The Earth King enters because Activated Sleeper copies it, its ability triggers again
5. SP//dr, Piloted by Peni — When SP//dr, Piloted by Peni enters because Activated Sleeper copies it, its ability triggers again
6. Mu Yanling, Wind Rider — When Mu Yanling, Wind Rider enters because Activated Sleeper copies it, its ability triggers again
7. The Rani — When The Rani enters because Activated Sleeper copies it, its ability triggers again
8. Ellivere of the Wild Court — When Ellivere of the Wild Court enters because Activated Sleeper copies it, its ability triggers again
9. J. Jonah Jameson — When J. Jonah Jameson enters because Activated Sleeper copies it, its ability triggers again
10. Ultimecia, Temporal Threat — When Ultimecia, Temporal Threat enters because Activated Sleeper copies it, its ability triggers again

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