msem-instigator

Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)
Whenever a creature you control enters, if you didn't cast it from your hand, target land you control becomes a 7/1 red Elemental creature with trample and haste. It's still a land.

Flying
Whenever a creature you control that isn't enchanted dies, adjudicate.
Whenever an enchanted creature you control dies, return it to the battlefield at the beginning of the next end step.

Flash
Enchant creature
Enchanted creature gets +3/+3.

When Covert Reinforcement enters, exile target nonland permanent an opponent controls until Covert Reinforcement leaves the battlefield.

Enchant creature or planeswalker
Enchanted permanent can't attack or block and loses all abilities.

You mill two cards, draw two cards, lose 2 life, and create two Treasure tokens. (They're artifacts with “{T}: Sacrifice this permanent: Add one mana of any color.”)

This spell has flash as long as you control a permanent with flash.
Put target nonland permanent on top of its owner's library.

Exile up to two target permanents you control, then return those cards to the battlefield under their owner's control.
Audition for blue. (Create a 1/1 Construct Actor creature token, a Wizard Role giving 2/2 and prowess, or a Warlock Role giving 2/1 and flying. Roles replace older ones.)

Flying
Whenever Crane Legionnaire attacks, tap target creature defending player controls.

Menace (This creature can't be blocked except by two or more creatures.)
Whenever Crazed Bruiser attacks, it gets +2/+0 until end of turn.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
{2}{G}: Crazed Sprareos gets +2/+2 until end of turn. Activate only once each turn.

First strike
Whenever Creed, Eternal Straggler attacks, exile the top card of your library. You may play that card this turn, and that spell costs {2} less to cast.

Create three 2/2 red Noble creature tokens with disgraced 1. (Each enters with a -1/-1 counter. Whenever one deals combat damage to a player, remove all -1/-1 counters from it.)

Distribute four -1/-1 counters among any number of target creatures.

When Crinster Blacksmith enters, nourish 2. (To nourish 2, either put two +1/+1 counters on this creature or create two 1/1 white Citizen creature tokens.)

Flying
Whenever an embattled creature you control attacks, tap target creature defending player controls. (A creature is embattled if it has a counter on it or has a permanent you control attached to it.)

Choose one or both—
• Target creature has base toughness 1 until end of turn.
• Remove all but one loyalty counter from target planeswalker.

(As an Encounter enters, choose an opponent to protect it. You and others can attack it. When defense counters are removed, create a 0/0 Army token if you don't control one, then put that many +1/+1 counters on a Army you control.)
When Crisis in Nizev enters, exile the top three cards of your library. Until the end of your next turn, you may play those cards.

Ward {2} (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays {2}.)
At the beginning of your end step, if you cast no spells this turn, exile the top card of your library. If it's a nonland card, you may cast it without paying its mana cost.

Extort (Whenever you cast a spell, you may pay {W/B}. If you do, each opponent loses 1 life and you gain that much life.)
Whenever Crowd Favorite extorts a spell, put a +1/+1 counter on Crowd Favorite.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
Other creatures you control with distorted get +2/+2.

Gain control of target creature until end of turn. Untap it. Until end of turn, it gains haste and “This creature can't be blocked.”
{1}, Discard Cruel Heartbeat: Add one mana of any color. Scry 1.

Destroy target creature.
Create a Vial token. (It's an artifact with “{1}, Sacrifice this and another permanent: Draw a card. Activate only during your turn.”)

Primal {1}{B} (During your turn, you may cast this spell for {1}{B} instead of playing a land.)
Each opponent discards two cards.

Experience (Whenever this creature attacks, if it has fewer than three +1/+1 counters on it, put a +1/+1 counter on it.)
Crusher Beetle can't be blocked by more than one creature.