Boreal Outrider

an Elf attacks — 723 cards in the game can cause this (Boreal Outrider is one).

When Boreal Outrider attacks:

1. Celeborn the Wise — scries
2. Tyvar the Bellicose — grants deathtouch
3. Harald Unites the Elves — shrinks a creature by -1/-1
4. Arboreal Alliance — triggers

a nontoken Elf enters the battlefield — 728 cards in the game can cause this (Boreal Outrider is one).

1. Wirewood Hivemaster — When Boreal Outrider enters, Wirewood Hivemaster makes a token

an Elf enters the battlefield — 752 cards in the game can cause this (Boreal Outrider is one).

When Boreal Outrider enters:

1. Wolverine Riders — gains you its toughness life
2. Elvish Warmaster — makes a token
3. Elvish Vanguard — puts a +1/+1 counter on itself
4. Marwyn, the Nurturer — puts a +1/+1 counter on itself
5. Woodland Weavemaster — gets +1/+1
6. High Perfect Morcant — puts a counter on a permanent an opponent controls
7. Maralen, Fae Ascendant — exiles a card from an opponent's library

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

a Warrior attacks — 1,319 cards in the game can cause this (Boreal Outrider is one).

1. Najeela, the Blade-Blossom — When Boreal Outrider attacks, Najeela, the Blade-Blossom makes a token

a Warrior deals combat damage — 1,319 cards in the game can cause this (Boreal Outrider is one).

1. Raiders' Spoils — When Boreal Outrider deals combat damage, Raiders' Spoils makes you lose life

a Warrior creature enters the battlefield — 1,401 cards in the game can cause this (Boreal Outrider is one).

1. Obsidian Battle-Axe — When Boreal Outrider enters, Obsidian Battle-Axe triggers

a Warrior enters the battlefield — 1,403 cards in the game can cause this (Boreal Outrider is one).

When Boreal Outrider enters:

1. Mardu Woe-Reaper — hits a graveyard
2. Thrasher Brute — makes each opponent lose 1 life
3. Decorated Champion — puts a +1/+1 counter on itself

a creature gets a counter — 2,691 cards in the game can cause this (Boreal Outrider is one).

1. Scurry Oak — When Scurry Oak gets a counter thanks to Boreal Outrider, it makes a token
2. Fathom Mage — When Fathom Mage gets a counter thanks to Boreal Outrider, it draws you 1 card
3. Hollowmurk Siege — When a creature gets a counter thanks to Boreal Outrider, Hollowmurk Siege draws you 1 card
4. Ant-Man, Colony Commander — When a creature gets a counter thanks to Boreal Outrider, Ant-Man, Colony Commander makes a token
5. Earth Kingdom General — When a creature gets a counter thanks to Boreal Outrider, Earth Kingdom General gains you that much life
6. Casey Jones, Back Alley Brute — When a creature gets a counter thanks to Boreal Outrider, Casey Jones, Back Alley Brute deals that much damage
7. Shalai and Hallar — When a creature gets a counter thanks to Boreal Outrider, Shalai and Hallar deals that much damage
8. Danny Pink — When a creature gets a counter thanks to Boreal Outrider, Danny Pink draws you 1 card
9. Enduring Scalelord — When a creature gets a counter thanks to Boreal Outrider, Enduring Scalelord puts a +1/+1 counter on itself
10. Mikey & Leo, Chaos & Order — When a creature gets a counter thanks to Boreal Outrider, Mikey & Leo, Chaos & Order draws you 1 card

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

anything gets a counter — 4,415 cards in the game can cause this (Boreal Outrider is one).

1. All Will Be One — When a creature gets a counter thanks to Boreal Outrider, All Will Be One deals that much damage
2. Lonis, Genetics Expert — When Lonis, Genetics Expert gets a counter thanks to Boreal Outrider, it triggers

7 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 (Boreal Outrider is one).

When Boreal Outrider 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

118 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 (Boreal Outrider is one).

When Boreal Outrider 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. Saw — sacrifices a creature
7. Gisa's Favorite Shovel — makes an opponent sacrifice a creature
8. Ultima Weapon — kills a creature an opponent controls
9. Total War — kills a creature

182 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 (Boreal Outrider is one).

When Boreal Outrider blocks:

1. Mage Hunters' Onslaught — makes a player lose 1 life
2. Tide of War — sacrifices a creature
3. Dead-Iron Sledge — kills a creature
4. Dwindle — kills a creature

24 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 (Boreal Outrider is one).

When Boreal Outrider enters:

1. Slash, Reptile Rampager — deals 2 damage
2. Ray Fillet, Wave Warrior — puts a counter on itself
3. The Neutrinos — gets +1/+0
4. Wingnut, Bat on the Belfry — grants flying, haste and menace
5. Aetherstorm Roc — puts a counter on a permanent you control
6. Raphael, Most Attitude — exiles a card from your library

314 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 (Boreal Outrider is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Boreal Outrider enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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