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When Blood Servitor enters the battlefield, create a Blood token.

When Blood Spatter Analysis enters the battlefield, it deals 3 damage to target creature an opponent controls.
Whenever one or more creatures die, mill a card and put a bloodstain counter on Blood Spatter Analysis. Then sacrifice it if it has five or more bloodstain counters on it. When you do, return target creature card from your graveyard to your hand.

When Blood Sun enters the battlefield, draw a card.
All lands lose all abilities except mana abilities.

Flying
When Blood-Toll Harpy enters the battlefield, each player loses 1 life.

When Bloodboil Sorcerer enters the battlefield, you take the initiative.
Crown of Madness — {1}{R}, Sacrifice an artifact or creature: Goad target creature.

Assist
When Bloodborn Scoundrels enters the battlefield, target opponent loses 2 life and you gain 2 life.

Menace
When Bloodcrazed Socialite enters the battlefield, create a Blood token.
Whenever Bloodcrazed Socialite attacks, you may sacrifice a Blood token. If you do, it gets +2/+2 until end of turn.

Bloodfell Caves enters the battlefield tapped.
When Bloodfell Caves enters the battlefield, you gain 1 life.
{T}: Add {B} or {R}.

Flying
When Bloodhunter Bat enters the battlefield, target player loses 2 life and you gain 2 life.

Multikicker {B}
When Bloodhusk Ritualist enters the battlefield, target opponent discards a card for each time it was kicked.

Lifelink
When Bloodline Necromancer enters the battlefield, you may return target Vampire or Wizard creature card from your graveyard to the battlefield.

When Bloodrage Alpha enters the battlefield, choose one —
* Another target Wolf or Werewolf you control fights target creature you don't control.
* You get a one-time boon with "When you cast a Wolf or Werewolf spell, it gains 'When this creature enters the battlefield, it fights up to one target creature you don't control.'"

When Bloodrage Brawler enters the battlefield, discard a card.

Haste
When Bloodthirsty Adversary enters the battlefield, you may pay {2}{R} any number of times. When you pay this cost one or more times, put that many +1/+1 counters on Bloodthirsty Adversary, then exile up to that many target instant and/or sorcery cards with mana value 3 or less from your graveyard and copy them. You may cast any number of the copies without paying their mana costs.

Flying
When Bloodtithe Collector enters the battlefield, if an opponent lost life this turn, each opponent discards a card.

When Bloodtithe Harvester enters the battlefield, create a Blood token.
{T}, Sacrifice Bloodtithe Harvester: Target creature gets -X/-X until end of turn, where X is twice the number of Blood tokens you control. Activate only as a sorcery.

Flying
Prowess
When Bloodwater Entity enters the battlefield, you may put target instant or sorcery card from your graveyard on top of your library.

When Bloom Hulk enters the battlefield, proliferate.

Reach
When Blossom Prancer enters the battlefield, look at the top five cards of your library. You may reveal a creature or enchantment card from among them and put it into your hand. Put the rest on the bottom of your library in a random order. If you didn't put a card into your hand this way, you gain 4 life.

Blossoming Sands enters the battlefield tapped.
When Blossoming Sands enters the battlefield, you gain 1 life.
{T}: Add {G} or {W}.

Flying
Lightning Breath — When Blue Dragon enters the battlefield, until your next turn, target creature an opponent controls gets -3/-0, up to one other target creature gets -2/-0, and up to one other target creature gets -1/-0.

When Blue Ribbon enters the battlefield, ask a person outside the game which creature you control is most deserving of a blue ribbon. Attach Blue Ribbon to that creature.
Equipped creature has best in show. (Whenever another creature becomes the target of a spell or ability you control, you may copy that spell or ability. If you do, the copy targets this creature.)
Equip {3}

When Boareskyr Tollkeeper enters the battlefield, target opponent reveals all creature and land cards in their hand. Choose one of them. That card perpetually gains "This permanent enters the battlefield tapped."

When Body Snatcher enters the battlefield, exile it unless you discard a creature card.
When Body Snatcher dies, exile Body Snatcher and return target creature card from your graveyard to the battlefield.

Kicker {B}
When Bog Badger enters the battlefield, if it was kicked, creatures you control gain menace until end of turn.