When Bloodtithe Harvester enters, create a Blood token. (It's an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.")

, 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, trample

Whenever an opponent casts a spell, that player creates a Blood token. (It's an artifact with ", , Discard a card, Sacrifice this artifact: Draw a card.")

Whenever Bloodvial Purveyor attacks, it gets +1/+0 until end of turn for each Blood token defending player controls.

: For each color among permanents you control, add one mana of that color.

Blooming Marsh enters tapped unless you control two or fewer other lands.

: Add or .

: Untap target land.

This land enters tapped.

When this land enters, you gain 1 life.

: Add or .

: An opponent tells you a statement about themselves and secretly notes whether it's true or false. You guess which it is. If you guessed correctly, Blufferfish gets +2/+0 and can't be blocked this turn.

Whenever you sacrifice another creature, put a +1/+1 counter on Body Dropper.

, Sacrifice another creature: Body Dropper gains menace until end of turn. (It can't be blocked except by two or more creatures.)

: Add .

, , Discard a card: Add .

Sacrifice another creature: Until end of turn, Bogardan Dragonheart becomes a Dragon with base power and toughness 4/4, flying, and haste.

Plainswalk (This creature can't be blocked as long as defending player controls a Plains.)

, Sacrifice Boggart Arsonists: Destroy target Scarecrow or Plains.

, Sacrifice Boggart Forager: Target player shuffles their library.

Bojuka Bog enters tapped.

When Bojuka Bog enters, exile target player's graveyard.

: Add .

You may look at the top card of your library any time.

You may play lands and cast spells from the top of your library. If you cast a spell this way, pay life equal to its mana value rather than pay its mana cost.

, Sacrifice ten nonland permanents: Each opponent loses 10 life.

Cowards can't block Warriors.

: Target creature becomes a Coward until end of turn.

: Target creature becomes a Warrior until end of turn.

When Bomat Bazaar Barge enters, draw a card.

Crew 3 (Tap any number of creatures you control with total power 3 or more: This Vehicle becomes an artifact creature until end of turn.)

: Put a fuse counter on target creature.

At the beginning of your upkeep, put a fuse counter on each creature with a fuse counter on it.

Whenever a creature has four or more fuse counters on it, remove all fuse counters from it and destroy it. That creature deals 4 damage to its controller.

: Transform Bonded Herdbeast. Activate only as a sorcery. ( can be paid with either or 2 life.)

: Add one mana of any color.

, : Each player who controls a permanent named Bonder's Ornament draws a card.

Flying

, Exile seven other cards from your graveyard: Return Bone Dragon from your graveyard to the battlefield tapped.

, : The next time a source of your choice would deal damage to you this turn, prevent that damage. Exile cards from the top of your library equal to the damage prevented this way.

Whenever equipped creature attacks, put four +1/+1 counters on it.

Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Until end of turn, Bone Shaman gains "Creatures dealt damage by Bone Shaman this turn can't be regenerated this turn."

, Pay 1 life: Draw a card. Activate only if three or more cards left your graveyard this turn or if you've sacrificed a Food this turn.

: Regenerate target Zombie.

Morph (You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)

Boneyard Mycodrax's power and toughness are each equal to the number of other creature cards in your graveyard.

Scavenge (, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

, Pay 2 life: Draw a card.

, , Sacrifice Boom Box: Destroy up to one target artifact, up to one target creature, and up to one target land.

: Flip a coin. If you win the flip, destroy all nonland permanents.

Lands you control have ": Create a Treasure token."

Whenever Borborygmos and Fblthp enters or attacks, draw a card, then you may discard any number of land cards. When you discard one or more cards this way, Borborygmos and Fblthp deals twice that much damage to target creature.

: Put Borborygmos and Fblthp into its owner's library third from the top.

: Boreal Centaur gets +1/+1 until end of turn. Activate only once each turn. ( can be paid with one mana from a snow source.)

Flying

: Boreal Griffin gains first strike until end of turn. ( can be paid with one mana from a snow source.)

, : Create a 1/1 black and red Demon creature token named Minor Demon.

Vigilance

Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.

Sacrifice Boromir, Warden of the Tower: Creatures you control gain indestructible until end of turn. The Ring tempts you.

: Add or .

, , Sacrifice Boros Cluestone: Draw a card.

This land enters tapped.

: Add or .

: Add or .

: Boros Keyrune becomes a 1/1 red and white Soldier artifact creature with double strike until end of turn. (It deals both first-strike and regular combat damage.)

Whenever Boros Reckoner is dealt damage, it deals that much damage to any target.

: Boros Reckoner gains first strike until end of turn.

: Add .

Channel — , Discard Boseiju, Who Endures: Destroy target artifact, enchantment, or nonbasic land an opponent controls. That player may search their library for a land card with a basic land type, put it onto the battlefield, then shuffle. This ability costs less to activate for each legendary creature you control.

Trample

, Sacrifice an artifact: Bosh, Iron Golem deals damage equal to the sacrificed artifact's mana value to any target.

Botanical Plaza enters tapped.

: Add or .

, , Sacrifice Botanical Plaza: Draw a card.

Sacrifice Bottle Gnomes: You gain 3 life.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for .)

Bottle-Cap Blast deals 5 damage to any target. If excess damage was dealt to a permanent this way, create that many tapped Treasure tokens. (They're artifacts with ", Sacrifice this artifact: Add one mana of any color.")

: Add .

Whenever Bounding Felidar attacks while saddled, put a +1/+1 counter on each other creature you control. You gain 1 life for each of those creatures.

Saddle 2 (Tap any number of other creatures you control with total power 2 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)

Bountiful Promenade enters tapped unless you have two or more opponents.

: Add or .

: Add one mana of any color.

, : Put a bounty counter on target creature. Activate only as a sorcery.

Whenever a creature with a bounty counter on it dies, each of its controller's opponents draws a card and gains 2 life.

Attacking creatures you control have deathtouch.

, : Choose one —

• Put a +1/+1 counter on target creature.

• Bow of Nylea deals 2 damage to target creature with flying.

• You gain 3 life.

• Put up to four target cards from your graveyard on the bottom of your library in any order.