msem-instigator

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

Bleed {1}{B}{B} (You may cast this spell for its bleed cost if an opponent has lost life this turn.)
All creatures get -4/-4 until end of turn.

Flying
Whenever Cavern Scourge attacks, you may exile a card from your graveyard. If you do, you gain 3 life.

Choose one —
• Destroy all creatures.
• Create a 4/4 white Angel creature token with flying and vigilance.

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

Flying
When Cerulean Curtain Treasurer enters, audition for blue, then audition for blue again. (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.)

When Ch'aska Walla Captain enters, if you cast it, you may return an enchantment card from your graveyard to the battlefield. When you do, you gain life equal to that enchantment's mana value.

Defiance (Whenever this creature takes damage, if it survives and wasn't defiant, put a +1/+1 counter on it and it becomes defiant.)
Each creature you control with a +1/+1 counter on it has lifelink.

Whenever a permanent enters under an opponent's control, reveal the top card of your library. If it's a permanent card that shares a type with that permanent, you may put it onto the battlefield. Otherwise, put it on the bottom of your library.

This spell costs {2} less to cast if you've cast a blue noncreature spell this turn. The same is true for a red noncreature spell.
Menace

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.)
Chaosphere Ravager attacks each combat if able.

For each creature target player controls, that player flips a coin. If the coin comes up tails, that player shuffles that creature into its owner's library.

Flying, haste
You may cast Charred Phoenix from your graveyard by exiling four permanents you control and/or cards in your hand and/or graveyard as an additional cost.

Crew 4 (Tap any number of creatures you control with total power 4 or greater: This Vehicle becomes an artifact creature until end of turn.)

Reach
Spirited (When this creature enters, you may activate one of its activated abilities without paying its costs.)
{3}{G}: Exile up to one target card from a graveyard. Scry 1.

When this creature enters, put two -1/-1 counters on a creature you control.
When you put one or more -1/-1 counters on one or more creatures, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Harmony — Tap target creature. That creature doesn't untap during its controller's next untap step.
When Chilling Musician enters, harmonize. (Trigger up to one harmony of one permanent you control.)

{G}{G}: Create a 2/2 green Wolf creature token.
{1}{G}{G}: Create Shimaru, the White Wolf, a legendary 3/3 green Wolf creature token with hexproof.
{2}{G}{G}: Creatures you control get +2/+2 and gain trample until end of turn.

Wolves you control have hexproof and “Whenever this creature deals combat damage to a player, draw a card.”
At the beginning of your end step, if you don't control a creature named Shimaru, the Unfading, create Shimaru, the Unfading, a legendary 4/4 green Wolf Spirit creature token with trample.

Flash
Flying, lifelink, deathtouch
When Chosen of Aminatou enters, scry 2, then draw a card.

As Chromatic Interloper enters, choose two abilities from among first strike, menace, vigilance, trample, or haste.
Creatures you control with mana value 5 or greater have the chosen abilities.

When Churning Sandwurms enters, remove all counters from target permanent. Put a +1/+1 counter on Churning Sandwurms for each counter removed this way.

This spell costs {3} less to cast if it targets a permanent with mana value 3 or less.
Gain control of target nonland permanent until end of turn. Untap it. It gains haste until end of turn.

Clash at Geier Reach deals 2 damage to each opponent and to each creature and planeswalker they control.
Cycling {2} ({2}, Discard this card: Draw a card.)

Target creature fights another target creature. (Each deals damage equal to its power to the other.)