Beta Ray Bill

a nontoken Hero enters the battlefield — 160 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

1. Black Panther, Vanguard — When Beta Ray Bill enters, Black Panther, Vanguard triggers

a Hero enters the battlefield — 169 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill enters:

1. Nighthawk, Dark Defender — gives +1/+1
2. Team Transmitter — gains you 1 life

a Warrior creature enters the battlefield — 501 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

1. Obsidian Battle-Axe — When Beta Ray Bill enters, Obsidian Battle-Axe triggers

a Warrior enters the battlefield — 503 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill enters:

1. Mardu Woe-Reaper — hits a graveyard
2. Decorated Champion — puts a +1/+1 counter on itself

a creature attacks — 6,741 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill attacks:

1. Adaptive Omnitool — searches a library
2. Staff of Titania — makes a token
3. Glory Bearers — gives +0/+1
4. Ancestor Dragon — gains you life
5. Patron of the Kitsune — gains you 1 life
6. Fractal Harness — puts counters on a permanent
7. Saw — sacrifices a creature
8. Ultima Weapon — kills a creature an opponent controls
9. Super-Soldier Serum — triggers
10. Throwing Knife — sacrifices itself

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

anything attacks — 6,741 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill attacks:

1. ED-E, Lonesome Eyebot — puts a quest counter on itself
2. Surgical Suite // Hospital Room — puts a counter on a creature
3. Apothecary White — makes a token
4. Adeline, Resplendent Cathar — makes a token
5. Guide of Souls — triggers
6. Campsite Cuisine — sacrifices a Food
7. Toph, Earthbending Master — puts a counter on a permanent
8. Dyadrine, Synthesis Amalgam — triggers
9. Ghalta and Mavren — triggers
10. Warren Warleader — triggers

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

a creature blocks — 6,741 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill blocks:

1. Barrow-Blade — strips abilities
2. Favor of the Woods — gains you 3 life
3. Gift of the Woods — gives +0/+3
4. Noble Stand — gains you 2 life
5. Noxious Assault — puts a counter on a permanent
6. Battle Cry — gives +0/+1
7. Ferocity — puts a counter on a permanent
8. Mammoth Harness — grants first strike
9. Dead-Iron Sledge — kills a creature

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

a nontoken creature attacks — 6,741 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill attacks:

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

a creature deals combat damage — 6,741 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

1. Antagonist Incorporator — When Beta Ray Bill deals combat damage, Antagonist Incorporator makes a token

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

a creature is cast — 6,766 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill is cast:

1. Primeval Bounty — makes a token
2. Dancing from Dark to Dawn — puts that spell's mana value counters on a creature
3. Summon: Fenrir — it arrives with counters thanks to Summon: Fenrir
4. Torens, Fist of the Angels — makes a token
5. God-Eternal Oketra — makes a token
6. Silk, Web Weaver — makes a token
7. Selvala, Eager Trailblazer — makes a token
8. Silverback Elder — triggers
9. Oltec Matterweaver — triggers
10. Pure Reflection — kills a Reflection

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

a nontoken creature enters the battlefield — 6,933 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill enters:

1. Samwise Gamgee — makes a token
2. Dual Nature — makes a token
3. Angelic Sell-Sword — makes a token
4. Saradoc, Master of Buckland — makes a token
5. Bramble Sovereign — makes a token
6. Spirit Bonds — makes a token
7. Soul of the Harvest — draws you 1 card
8. Radiant Solar — triggers
9. Gylwain, Casting Director — triggers

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

a creature enters the battlefield — 7,580 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

When Beta Ray Bill enters:

1. Legolas Greenleaf — puts a counter on a permanent
2. Aetherstorm Roc — puts a counter on a permanent you control

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

anything enters the battlefield — 11,072 cards in Beta Ray Bill's colors can cause this (Beta Ray Bill is one).

1. Prowl, Stoic Strategist // Prowl, Pursuit Vehicle — When Beta Ray Bill enters, Prowl, Stoic Strategist // Prowl, Pursuit Vehicle puts a +1/+1 counter on itself

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