Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, return target permanent card from your graveyard to your hand.

Draw four cards.
Cycling (, Discard this card: Draw a card.)

Boot Nipper enters the battlefield with your choice of a deathtouch counter or a lifelink counter on it.

Target creature gets +2/+0 until end of turn. (Then exile this card. You may cast the creature later from exile.)

: Add .

: Bramblefort Fink has base power and toughness 10/10 until end of turn. Activate this ability only if you control an Oko planeswalker.

: Add .

Indestructible
Whenever Brash Taunter is dealt damage, it deals that much damage to target opponent.
, : Brash Taunter fights another target creature.

Flash
Flying
Brazen Borrower can block only creatures with flying.

: Add .

Defender, reach
: Brimstone Trebuchet deals 1 damage to each opponent.
Whenever a Knight enters the battlefield under your control, untap Brimstone Trebuchet.

This spell costs less to cast for each enchantment you control.

Create two 1/1 white Human creature tokens. (Then exile this card. You may cast the creature later from exile.)

Target noncreature artifact you control becomes a 0/0 artifact creature. Put four +1/+1 counters on it.

Bristling Boar can't be blocked by more than one creature.

Destroy target artifact, enchantment, or creature with flying.

Mutate (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Trample
You may cast Brokkos, Apex of Forever from your graveyard using its mutate ability.

Equipped creature gets +2/+0.
Equip (: Attach to target creature you control. Equip only as a sorcery.)

: Bronzehide Lion gains indestructible until end of turn.
When Bronzehide Lion dies, return it to the battlefield. It's an Aura enchantment with enchant creature you control and ": Enchanted creature gains indestructible until end of turn," and it loses all other abilities.

Haste
Brushfire Elemental can't be blocked by creatures with power 2 or less.
Landfall — Whenever a land enters the battlefield under your control, Brushfire Elemental gets +2/+2 until end of turn.