msem-instigator

As an additional cost to cast this spell, you may sacrifice a creature.
Create a 1/1 green Insect creature token. If you sacrificed a creature to cast this spell, create three of those tokens instead.

Mill three cards, then return an artifact or creature card from your graveyard to your hand.

Exile target creature. Its controller loses 3 life.

Citadel Bagworm gets +0/+1 for each card in your graveyard.
{B}, Discard a card: Switch Citadel Bagworm's power and toughness until end of turn.

Flash
Flying, first strike, lifelink

If you would draw one or more cards, you may have each player draw an additional card.
Spells cost {1} less to cast if a player cast a spell this turn.

When Wondering Oaf dies, return target instant or sorcery card from your graveyard to your hand.

Return target creature to its owner's hand. If you controlled that creature, draw a card.

Flying
Whenever Wandering Dragonfly or another creature you control enters, you may draw a card. If you do, discard a card.

You may have Undecided Mimic enter or phase in as a copy of any creature on the battlefield, except it has this ability and “{2}{U}{U}: Undecided Mimic phases out.” (Treat it and anything attached to it as though they don't exist until its controller's next turn.)

When Truffle Snuffer enters, mill three cards. When you do, choose one —
• Return an instant or sorcery card put into your graveyard this way to your hand.
• Put two +1/+1 counters on Truffle Snuffer.

Vanguard — Whenever a creature you control attacks alone, draw a card.

Choose target permanent. Take an extra turn after this one. During that turn's untap step, permanents other than the chosen permanent phase out until end of turn. Exile Time Stands Still.

Once each turn, when a creature you control becomes tapped, you may untap that creature and tap up to one target creature.

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.)
Take an extra turn after this one. Exile Temporal Aria.

Look at the top three cards of your library. Put one of them into your hand and the rest into your graveyard.

Whenever Starlight Emissary harnesses a spell, draw a card.

Vanguard — Whenever a creature you control attacks alone, you may exile target instant or sorcery card from your graveyard. If you do, you may cast that spell from exile until your next turn. If that spell would be put into a graveyard, exile it instead.

Whenever a player casts an instant or sorcery spell from their hand, you may exile that card as it resolves instead of putting it anywhere else.
Whenever Skill Sketcher attacks, you may cast a card exiled with it. That spell costs {X} less to cast, where X is Skill Sketcher's power.

Flying
When Sharp-Eyed Wingmate enters, you may return target creature to its owner's hand.

Vanguard — Whenever a creature you control attacks alone, gain control of target nonland permanent for as long as you control The Rocket Gang Strikes!.

Counter target spell. If a noncreature spell is countered this way, scry 2.

Whenever Poised Koi attacks or blocks, look at the top two cards of your library, put any of them into your graveyard, then the rest back on top in any order.

Spells your opponents cast that target Onigori, Ema's Shield cost {2} more to cast.
Whenever Onigori deals combat damage to a player, that player can't untap more than two permanents during their next untap step.

{X}{U}{U}: Marine Monster can't be blocked by creatures with mana value X or less this turn.