msem-instigator

Whenever a creature enters the battlefield under your control, you may have it get +1/+1 until end of turn. If you do, it fights target creature. (Each deals damage equal to its power to the other.)

Shredding Gale deals 4 damage to each creature with flying.

Skavi Behemoth can't be the target of nongreen spells or abilities from nongreen sources.

Reach (This creature can block creatures with flying.)
When Spider Broodmother dies, create two 1/2 green Spider creature tokens with reach. (This creature can block creatures with flying.)

Flash (You may cast this spell any time you could cast an instant.)
Enchant creature
Enchanted creature gets +2/+2.

Put target permanent card from your graveyard on top of your library.

Choose one—
• Prevent all damage that would be dealt by creatures without flying this turn.
• Prevent all damage that would be dealt by creatures with flying this turn.

Remove a +1/+1 counter from a creature you control: Regenerate Verendas Brawler. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)

When Verendas Spiritwalker enters the battlefield, you may put a +1/+1 counter on target creature.

At the beginning of your upkeep, you may pay {G}. If you do, you may put a +1/+1 counter on target creature you control and you gain 2 life.

Target creature gets +2/+2 and gains trample until end of turn.

{3}: Wildwood Keeper gets +3/+2 until end of turn. Activate only once each turn.

Whenever an enchantment enters the battlefield under your control, draw a card.

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
At the beginning of each end step, if you lost life this turn, you may pay {1}. If you do, create a 2/2 black Zombie creature token.

Attacking creatures you control get +1/+0.

Deathtouch (Any amount of damage this deals to a creature is enough to destroy it.)
When Grave Revenant enters the battlefield, target opponent loses life equal to the number of creature cards in your graveyard.

First strike (This creature deals combat damage before creatures without first strike.)
Whenever a creature you control becomes blocked by a creature, Itava Scourge deals 1 damage to that creature's controller.

Whenever a land enters the battlefield under your control, create a 3/3 red and green Elemental creature token.

Prowess
When Magus Aspirant enters the battlefield, you may search your library for an instant or sorcery card, reveal it, put it into your hand, then shuffle.

Flash (You may cast this spell any time you could cast an instant.)
When Mist Lurker enters the battlefield, tap all creatures you don't control.

Whenever a creature enters the battlefield under an opponent's control, draw a card unless that player pays {1}.

{1}: Choose one. Activate only once each turn.
• Adaptive Servitor gets +1/+1 and gains first strike until end of turn.
• Adaptive Servitor gets +2/+0 and gains trample until end of turn.

Equipped creature has “Whenever this creature attacks or blocks, choose a creature card in your graveyard. This creature gets +X/+Y until end of turn, where X is that card's power and Y is its toughness.”
Equip {2}