The Blue Spirit

an Ally deals combat damage — 265 cards in the game can cause this (The Blue Spirit is one).

1. Invasion Tactics — When The Blue Spirit deals combat damage, Invasion Tactics draws you 1 card

an Ally enters the battlefield — 285 cards in the game can cause this (The Blue Spirit is one).

When The Blue Spirit enters:

1. Turntimber Ranger — makes a token
2. Grovetender Druids — makes a token
3. Halimar Excavator — mills a card
4. Kalastria Healer — makes each opponent lose 1 life
5. South Pole Voyager — gains you 1 life
6. Ondu Cleric — gains you life
7. Tuktuk Grunts — puts a +1/+1 counter on itself
8. Sokka and Suki — triggers
9. Tuktuk Scrapper — kills an artifact an opponent controls
10. Bala Ged Thief — triggers

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

a Rogue attacks — 636 cards in the game can cause this (The Blue Spirit is one).

1. Soaring Thought-Thief — When The Blue Spirit attacks, Soaring Thought-Thief mills a card

a Rogue deals combat damage — 636 cards in the game can cause this (The Blue Spirit is one).

1. Anowon, the Ruin Thief — When The Blue Spirit deals combat damage, Anowon, the Ruin Thief mills a card

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

a Rogue creature enters the battlefield — 657 cards in the game can cause this (The Blue Spirit is one).

1. Cloak and Dagger — When The Blue Spirit enters, Cloak and Dagger triggers

a Rogue enters the battlefield — 659 cards in the game can cause this (The Blue Spirit is one).

1. Thieves' Guild Enforcer — When The Blue Spirit enters, Thieves' Guild Enforcer mills a card

a card is drawn — 3,815 cards in the game can cause this (The Blue Spirit is one).

When The Blue Spirit makes a player draw a card:

1. Temmet, Naktamun's Will — gives +1/+1
2. Niv-Mizzet, Parun — deals 1 damage
3. Aether Syphon — mills a card
4. The Locust God — makes a token
5. Starving Revenant — makes each opponent lose 1 life
6. Diviner's Wand — gets +1/+1
7. Ominous Seas — puts a foreshadow counter on itself
8. Dream Trawler — gets +1/+0
9. Iron Man, Armored Avenger — puts a counter on a creature
10. The Astonishing Ant-Man — puts a +1/+1 counter on itself

57 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 (The Blue Spirit is one).

When The Blue Spirit 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 (The Blue Spirit is one).

When The Blue Spirit attacks:

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

115 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 (The Blue Spirit is one).

When The Blue Spirit 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. Saw — sacrifices a creature

188 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 (The Blue Spirit is one).

1. Tide of War — When The Blue Spirit blocks, Tide of War sacrifices a creature

27 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 (The Blue Spirit is one).

When The Blue Spirit 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

352 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 (The Blue Spirit is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When The Blue Spirit enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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