Flash
When Blind Keelah enters and whenever you cast a spell during an opponent's turn, each opponent loses 1 life and you surveil 1. This ability triggers only once each turn.

Enchant creature
Enchanted creature can't attack or block.

Ward {X}, where X is the number of differently named lands you control.

Flying, haste
When Blistering Cryophoenix enters, discard any number of cards, then draw that many cards.
If a spell you own which had its flashback cost paid would be put into exile, put it into your hand instead.

Whenever Bloom Brute deals combat damage to a player, create two Berry tokens.

Flying
When Blooming Sauropod enters, create two Berry tokens, then sacrifice any number of Berries. For each Berry sacrificed this way, put a +1/+1 counter on another creature you control.

Flying
When Blue Collar Bloodsucker enters, you gain 2 life. Then if you control a red permanent, Blue Collar Bloodsucker deals 2 damage to each opponent.

Defender
{3}{W}, {T}, Sacrifice Border Junction: Create three 1/1 colorless Soldier creature tokens. Activate only as a sorcery.

Whenever a creature card or creature token is put into your graveyard from anywhere, put a +1/+1 counter on Bottom Feeder.

Bouncers-for-Hire can't attack unless you control a red permanent.

Brass Laborer enters with two reach counters on it.

Whenever you cast an instant spell, put a +1/+1 counter on Brass Oracle.
Whenever you cast a sorcery spell, Brass Oracle deals damage to target opponent equal to its power.

Lifelink
Approval — {5}, {T}: Tap target creature. This ability costs {X} less to activate, where X is the number of colors among permanents you control.

Flying
When Breaching Jaxl enters, untap target nonland permanent.
Wander {2}{U}

Haste
Whenever you amp it up, put a +1/+1 counter on Breakbot. It gains first strike until end of turn.

Trample
Breaking Ground must be blocked if able.
{T}: Add {C}.
Spellcharge 9

Trample
Landfall — Whenever a land you control enters, target creature blocks Brick Breaker this turn if able.

{VP}{VP}{VP}, Sacrifice Bright-Lights Terrier: Creatures you control gain indestructible until end of turn.

Flying
When Bringer of Heliod's Light enters, you may bless target creature.

Once each turn, when you activate a nonmana ability, you may have Bubbling Firesnail deal 1 damage to each opponent.
{1}{R}: Bubbling Firesnail gets +2/-2 until end of turn.

Vigilance
Whenever Builder of Monuments attacks, put a build counter on it. Then you may search your library for an artifact or enchantment card with mana value less than or equal to the number of build counters on Builder of Monuments, put that card onto the battlefield, then shuffle.

You can't cast noncreature spells.
Creature spells you cast cost {X} less to cast, where X is the greatest power among creatures you control.

Reach
Bumbling Bigfoot doesn't untap during your untap step.
Wander {1}{G}{G}

Amity — Whenever you attack with Bumbling Pollinator and exactly one other creature, create a 1/1 green Plant creature token.

Drop — When Bumping Betta enters, if you didn't cast any creature spells during your last turn, return up to one target nonland permanent to its owner's hand.