msem-instigator

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.

When Bridled Narwhal enters, you gain 5 life.

Deathtouch
When Brig of the Damned enters, return target creature card from your graveyard to your hand. If that card's mana value is 2, you may return it to the battlefield instead.
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

Defender
When Brine Duelist enters, create a Treasure token. (It's an artifact with “{T}, Sacrifice this permanent: Add one mana of any color.”)
{W}{U}{B}{R}{G}: Put a +1/+1 counter on Brine Duelist. It loses defender.

Trample
When Bringer of Armies enters, recruit. (Create a 0/0 white Soldier Army creature token, then put a +1/+1 counter on each Army you control.)

Flying, vigilance
Protection from Humans (This creature can't be blocked, targeted or dealt damage by Humans.)

Bronze Giant has trample as long as you control a token creature.

Ward {2}
Whenever Brunig enters or attacks, you may shuffle a card you own from outside the game into your library. If you do, you gain 2 life.
Brunig gets +2/+2 and has trample as long as your library contains at least forty cards more than the minimum deck size.

Reach
Hexproof (This creature can't be the target of spells or abilities your opponents control.)

Whenever another creature enters, Brutish Champion fights that creature.

Concord — Whenever Bubbledome Captain attacks, if there are four or more card types among permanents you control, each other attacking creature gets +1/+1 until end of turn.

Flash
Flying
At the beginning of your upkeep, you may choose one that hasn't been chosen from among upkeep, draw, combat and end. After the first step of that type this turn, you get an additional step of that type.

Whenever Burning Hart deals combat damage to a player, it deals that much damage to up to one target planeswalker that player controls.

Bwema, the Ruthless enters with your choice of two different counters on it from among menace, first strike, vigilance, and lifelink.

Haste
Sacrifice another creature: Bygone Aristocrat gains indestructible until end of turn.

During your turn, cards in your hand have cycling {X}, where X is the number of cards you've discarded this turn.
At the beginning of each end step, create a 1/1 blue Tentacle creature token for each card you discarded this turn.
Cycling {R} ({R}, Discard this card: Draw a card.)

Flying
When Calamity Harbinger enters, it deals 4 damage to up to one target creature or planeswalker.

Primal {W} (During your turn, you may cast this spell for {W} instead of playing a land.)
When Captured Paletusk enters, you may search your library for a basic Plains card, put it onto the battlefield tapped, then shuffle. You gain 2 life. Then sacrifice Captured Paletusk if it was cast for its primal cost.

Haste
When Caravan Engulfer enters, creatures you don't control can't block this turn.

Wither (This deals damage to creatures in the form of -1/-1 counters.)

{2}: Carven Guardian gains reach until end of turn.

Reach
As Celestial Principality enters, choose a number.
Noncreature spells with mana value equal to the chosen number can't be cast.

Flying (This creature can't be blocked except by creatures with flying or reach.)
Motivate 1 (When this creature enters, you may motivate target creature with less power than this by putting a +1/+1 counter on it.)

Trample
{4}{G}: Centaur Warband gets +2/+2 until end of turn.

Chained Wildborn can't attack or block alone.