msem-instigator

Flying
When Greater Swooprat enters, creatures your opponents control get -1/-1 until end of turn.

When Tantalizing Glutton enters, create a green Aura Curse enchantment token named Just Out of Reach attached to target player. The token has enchant player and “At the beginning of each of enchanted player's opponents' upkeeps, if that player doesn't control a Food, they create a Food token.”

Controlled Burn deals 2 damage to target player or planeswalker.
At the beginning of your upkeep, you may exile Controlled Burn from your graveyard. If you do, it deals 2 damage to target player or planeswalker.

Whenever another creature named Crinster Sheepdog enters, nourish 1. (To nourish 1, either put a +1/+1 counter on this creature or create a 1/1 white Citizen creature token.)

Whenever you cast a black spell, put a +1/+1 counter on Flenser's Lieutenant.
{B}{B}: Return Flenser's Lieutenant from your graveyard to your hand.

Draw a card. Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Ravenous Grue enters with a menace counter on it.
{5}{B}{B}, Remove a menace counter from Ravenous Grue: Destroy target creature.

Menace, lifelink
Whenever a creature enters under an opponent's control, you may have that player lose 1 life.

Captain Fina Redtail can't be blocked as long as you control another attacking Pirate.
Whenever Captain Fina Redtail deals combat damage to a player, you may pay {2}. If you do, create a 2/1 black and red Cat Pirate creature token with menace.

Enchant creature (Target a creature as you cast this. This card enters attached to that creature.)
Enchanted creature gets +1/+3.
Whenever enchanted creature attacks, you gain 1 life.

Augmented — Whenever you cast a spell, if you've spent {W}{U}{B}{R}{G} to cast spells this turn, you may activate one of Glitch's loyalty abilities.
[+1]: You gain 3 life and draw a card, then you may put a land card from your hand onto the battlefield tapped.
[–3]: Exile target nonland permanent. Glitch gains its activated and triggered abilities.
[–6]: Choose a number. Each player sacrifices that many nonland, non-Glitch permanents.

Enchant creature
Enchanted creature has double strike and “Other creatures you control have first strike.”

Abandoned Meadow enters tapped if you control another nonbasic land.
{T}: Add {R} or {G}.

Flying
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Return target creature card from a graveyard to the battlefield under your control. Post a bounty on that creature. (Put a bounty counter on that creature. It has “When this creature dies, each opponent draws a card” as long as it has a bounty counter on it.)

Archive 3 (As this enters, shuffle the top three cards of your main library into a new face up library. Sacrifice this after the archived library is empty.)
Whenever you draw a card from the archived library, put the top card of your main library on the bottom of the archived library.
{W}: Exchange a card from the archived library with a card from your hand.

Create a 1/1 blue Advisor creature token.
Draw a card.

When Undying Lich dies, create a 6/3 black Zombie Horror creature token with menace and “When this creature dies, create an 8/5 black Elder Demon Horror creature token with flying, deathtouch, and menace.”

{B}, Sacrifice another creature: Exile target card in an opponent's graveyard. You may cast that card for as long as it remains exiled, and you may spend mana as though it were mana of any color to cast that spell. Activate only as a sorcery.

{1}{R}, {T}: Target creature gains shimmer until end of turn. (Whenever it attacks this turn, create a tapped and attacking token that's a copy of it. Exile that token at the beginning of the end step.)

Lifelink (Damage dealt by this creature also causes you to gain that much life.)
{1}{B}: You gain 1 life.

When Bird Call enters, search your library for a creature card, reveal it, shuffle, then put that card on top.
{2}, {T}: Target creature gets +1/+1 until end of turn.

Rapport — Whenever Tinkering Swarm and at least one other creature you control become tapped, create a token that's a copy of Tinkering Swarm.

Harness (You may tap a creature you control as you cast this spell. If you do, reduce this spell's mana cost by that creature's power.)
Flamethrower deals 4 damage to any target.

Menace
Shimmer (Whenever this creature attacks, create a tapped and attacking token that's a copy of it. Exile the token at the beginning of the end step.)