msem-instigator

Look at the top two cards of your library. Put one of them into your hand, then submerge the other. (To submerge a card, exile it, then put it on the battlefield face down under its owner's control as a 2/2 creature.)

Return target creature you control to its owner's hand. You gain life equal to its power.

Creatures you control get +2/+2.
Lifecycle {3} ({3}, Discard this card: Create two tapped 1/1 colorless Elemental creature tokens.)

Create two 1/1 white Soldier creature tokens. You gain 4 life.

Pressure {2}{B}{B} (You may cast this spell for its pressure cost if seven or more cards are in your graveyard.)
When Gloomtide Whelk enters, all other creatures get -4/-4 until end of turn.

Vigilance
Sun's Own has indestructible as long as it's your turn.

Flash
Flying
When Sharuum, Archmagocrat enters, return to the battlefield all nonlegendary artifact cards in your graveyard that were put there from the battlefield this turn.

Target creature gets -3/-3 until end of turn. Scry 2.

When Ophidian Oracle enters, draw a card, then abound. (To abound, you may cast a spell that costs less than this from your hand without paying its mana cost.)
Recite {2}{G}{G} (You may cast this creature from your graveyard for its recite cost. If you do, exile it when it enters or if it would leave the battlefield.)

When Blacksite Moderator enters, you may pay 2 life or sacrifice a permanent. If you do, draw a card.

TT-20 Salvation gets +1/+1 for each other artifact you control.
As TT-20 Salvation enters, create a 1/1 colorless Servo artifact creature token.

Whenever Rambunctious Upstart attacks, up to one target creature gets -3/-1 until end of turn and up to one target creature gets +3/+1 until end of turn.

{T}: Look at the top card of your library. If it's a land card, you may reveal it and put it into your hand.
Crew 2 (Tap any number of creatures you control with total power 2 or greater: This Vehicle becomes an artifact creature until end of turn.)

When Paleolizard enters, you may discard a card. When you do, return target card from your graveyard to your hand that shares a type with that card.

Scornful Flames deals 4 damage to target player.
Dominance — Scornful Flames deals 1 damage to each creature that player controls if you control the creature with the greatest power or tied for the greatest power.

Deathtouch
Artifacts and creatures your opponents control have “At the beginning of your upkeep, you lose 1 life unless you tap this permanent and have an opponent gain control of it.”

{T}: Choose a color of a card in your graveyard. Add one mana of that color.

You may play Paradise Reef from your graveyard as long as seven or more cards are in your graveyard.
Paradise Reef enters tapped.
{T}: Add {G} or {W}.
Cycling {1}{G}{W} ({1}{G}{W}, Discard this card: Draw a card.)

Target creature gets -2/-2 until end of turn. Mill two cards.

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
Sacrifice Bonetooth Darter: Counter target instant, planeswalker, or sorcery spell unless its controller pays {1}.

Whenever Benevolent Host attacks, if you control another Angel or Nephilim, Benevolent Host gains flying until end of turn. Surveil 1.

Create a 1/1 white Bird creature token with flying, then invigorate 1. (Choose a creature with the least power among creatures you control and put a +1/+1 counter on it.)

Destroy target noncreature permanent. Its controller may search their library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Wanderlust — When you cast this spell, you may copy it if you control four or more differently named lands. You may choose new targets for the copy.
Search your library for a creature or land card, reveal it, put it into your hand, then shuffle.