msem-instigator

Flying
{1}, Sacrifice another creature: Regenerate target Vampire.

This spell costs {1} less to cast for each creature that attacked this turn.

Other Warriors you control get +2/+0.
Whenever a Warrior you control dies, Bloodshed Devotee deals 1 damage to target opponent.

{T}: Another target Warrior you control gets +1/+0 and gains haste until end of turn.

Trample
Bloodthirsty Berserkers can't be blocked by more than one creature.

Menace (This creature can't be blocked except by two or more creatures.)
Cycling {R} ({R}, Discard this card: Draw a card.)

Flying
When Blossoming Hatchling enters the battlefield, create a Treasure token.

Bogchomper Juggernaut attacks each combat if able.
Bogchomper Juggernaut can't be blocked by Fungus, Saprolings, Plants, or Insects.

First strike
{T}: Bogclaw Sniper deals 2 damage to target blocking creature.

Flying
When Bogsnatcher Drake enters the battlefield, create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)

Whenever Bold Vanquisher attacks, upgrade it. (Give it one of the listed counters it doesn't already have.)
• +1/+1
• Trample

Haste
Augmented — Whenever you cast a spell, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, put a +1/+1 counter on Bolstered Guardian. It loses this ability and gains “Whenever this attacks, it deals 2 damage to each of up to two targets.”

When Bone Pit Raptor enters the battlefield, other creatures you control get +1/-1 until end of turn.
Revive {2}{R} ({2}{R}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

When Boneweary Warrior dies, you may put a -1/-1 counter on target creature.

When Border Seeker dies, search your library for a basic land card, put it onto the battlefield tapped, then shuffle. Then you gain 1 life for each land you control.

When Borderland Garrison enters the battlefield, it deals 1 damage to up to one target creature and 1 damage to you.

Vigilance, deathtouch
Civilized — When Bordermakers enters the battlefield, if you control a creature, an artifact, and an enchantment, each opponent loses 4 life and you gain 4 life.

Whenever Borsuppa Roughrider attacks, create a colorless Desert land token named Scoured Path with “{T}: Add {R}.” Sacrifice that token at the beginning of the next end step.

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Bounty Crusher has trample as long as it's being blocked by a marked creature.

Harmony — Create a colorless artifact token named Lotus Petal with “{T}, Sacrifice this artifact: Add one mana of any color.”
When Bouquet Singer enters the battlefield, harmonize. (Trigger up to one harmony of one permanent you control.)

Whenever Bourasan Street Watch attacks, you may pay {W}. If you do, Bourasan Street Watch gains indestructible until end of turn.

Trample
{1}{G}: Brackish Kelpie gets +2/+2 until end of turn. Activate only once each turn.

Branch Prowler can't be blocked except by creatures with flying.

When Brand New Species enters the battlefield, create a tapped 3/2 green Horror creature token.
Augmented — At the beginning of each end step, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, put a +1/+1 counter on up to one target Horror you control.