Backup 1 (When this creature enters, put a +1/+1 counter on target creature. If that's another creature, it gains the following abilities until end of turn.)

Flying, first strike, lifelink

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

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.

Vigilance

When Borderland Explorer enters, each player may discard a card. Each player who discarded a card this way may search their library for a basic land card, reveal it, put it into their hand, then shuffle.

: 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

Spells your opponents cast that target Boreal Elemental cost more to cast.

Whenever you cast a creature spell, if of any of that spell's colors was spent to cast it, that creature enters with an additional +1/+1 counter on it. ( is 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.

Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)

: Boros Challenger gets +1/+1 until end of turn.

: Target creature gains haste until end of turn.

: Target creature gains first strike until end of turn.

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

: Boros Reckoner gains first strike until end of turn.

Battalion — Whenever Boros Strike-Captain and at least two other creatures attack, exile the top card of your library. During any turn you attacked with three or more creatures, you may play that card.

Domain — When Bortuk Bonerattle enters, if you cast it, choose target creature card in your graveyard. Return that card to the battlefield if its mana value is less than or equal to the number of basic land types among lands you control. Otherwise, put it into your hand.

Trample

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

Boss's Chauffeur enters with a number of +1/+1 counters on it equal to one plus the number of other creatures you control.

Alliance — Whenever another creature you control enters, put a +1/+1 counter on Boss's Chauffeur.

When Boss's Chauffeur dies, create a 1/1 green and white Citizen creature token for each +1/+1 counter on it.

Menace

Goaded creatures your opponents control can't block.

Whenever you cast a noncreature spell, goad target creature an opponent controls. (Until your next turn, that creature attacks each combat if able and attacks a player other than you if able.)

Trample

When Bottle Golems dies, you gain life equal to its power.

When Boulderbranch Golem enters, you gain life equal to its power.

//PRT-Prototype_Mech//

Prototype (You may cast this spell with different mana cost, color, and size. It keeps its abilities and types.)

3/3

At the beginning of combat on your turn, if you control a creature with power 4 or greater, you may discard a card. If you do, draw a card.

Flash (You may cast this spell any time you could cast an instant.)

When Bounding Krasis enters, you may tap or untap target creature.

Flying

Whenever you cast a Spirit or Arcane spell, you may gain life equal to that spell's mana value.

: Put a bounty counter on target nonblack creature.

: Destroy target creature with a bounty counter on it.

When Brackwater Elemental attacks or blocks, sacrifice it at the beginning of the next end step.

Unearth (: Return this card from your graveyard to the battlefield. It gains haste. Exile it at the beginning of the next end step or if it would leave the battlefield. Unearth only as a sorcery.)

While voting, you get an additional vote. (The votes can be for different choices or for the same choice.)

At the beginning of each player's upkeep, that player sacrifices an artifact, creature, or land.

When you cast this spell, any player may sacrifice a creature. If a player does, counter Brain Gorgers.

Madness (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)

Intimidate (This creature can't be blocked except by artifact creatures and/or creatures that share a color with it.)

Sacrifice Brain Weevil: Target player discards two cards. Activate only as a sorcery.

Partner with Shabraz, the Skyshark (When this creature enters, target player may put Shabraz into their hand from their library, then shuffle.)

Whenever you discard a card, put a +1/+1 counter on Brallin, Skyshark Rider and it deals 1 damage to each opponent.

: Target Shark gains trample until end of turn.

Whenever an Aura becomes attached to Bramble Elemental, create two 1/1 green Saproling creature tokens.

Whenever another nontoken creature enters, you may pay . If you do, that creature's controller creates a token that's a copy of that creature.

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

Whenever you expend 4, Raccoons you control get +1/+1 and gain vigilance until end of turn. (You expend 4 as you spend your fourth total mana to cast spells during a turn.)

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

Reach

Branch of Boseiju gets +1/+1 for each land you control.

Trample

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

At the beginning of each upkeep, if a player cast two or more spells last turn, transform Branded Howler.

Indestructible

Whenever Brash Taunter is dealt damage, it deals that much damage to target opponent.

, : Brash Taunter fights another target creature.

As Brass Herald enters, choose a creature type.

When Brass Herald enters, reveal the top four cards of your library. Put all creature cards of the chosen type revealed this way into your hand and the rest on the bottom of your library in any order.

Creatures of the chosen type get +1/+1.

, Sacrifice Brass Secretary: Draw a card.

Brassclaw Orcs can't block creatures with power 2 or greater.

, : Target creature gets +1/+1 until end of turn. Activate only as a sorcery.

Trample

As long as Brawn is in your graveyard and you control a Forest, creatures you control have trample.

Flash

Flying

Brazen Borrower can block only creatures with flying.

First strike

Whenever Brazen Collector attacks, add . Until end of turn, you don't lose this mana as steps and phases end.

When Brazen Freebooter enters, create a Treasure token. (It's an artifact with ", Sacrifice this artifact: Add one mana of any color.")

Vigilance

When Brazen Upstart dies, look at the top five cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in a random order.