msem-instigator

Whenever Yri, the Daring Blade and exactly one other creature attack, Yri and that creature can't be blocked by creatures with mana value 3 or less this turn.

Flying, vigilance
If a nonland permanent entering the battlefield would cause a triggered ability of a permanent you control to trigger, you may have that ability trigger an additional time. If you do, each opponent copies that ability and may choose new targets for the copies.

Until end of turn, creatures you control get +1/+1 and creatures your opponents control get -1/-1.

Flying, ward {2}
Whenever you cast a noncreature spell, choose up to one target creature. If that spell's mana value is greater than that creature's power, put +1/+1 counters on it equal to the difference.

Equipped creature has vigilance.
Equipped creature gets +3/+3 as long as you control a Spirit.
Equip {1}

Draw a card, then each player draws a card.

Trample, haste
Crew—Tap three untapped artifacts and/or creatures you control.

Add two mana in any combination of colors. (Then exile this card. You may cast the creature later from exile.)

Whenever you cast an instant, sorcery, or Wizard spell, Leafdown Sizzlemage gets +1/+0 until end of turn.

Counter target enchantment, instant, or sorcery spell. (Then exile this card. You may cast the creature later from exile.)

Choose highest or lowest. Target opponent reveals their hand and discards a card with the chosen kind of mana value among the revealed nonland cards.

Reveal the top three cards of your library. Put one into your hand and the rest on the bottom of your library in any order.

Whenever Shifty Fink attacks, if you have more cards in hand than defending player, it gets +2/+1 until end of turn.

Ward {2}
Slippery Bunyip can't be blocked except by creatures with Adventures.

Target opponent discards two cards. You gain 2 life. (Then exile this card. You may cast the creature later from exile.)

Target creature gets -X/-X until end of turn, where X is the number of cards in your graveyard. If that creature would die this turn, exile it instead.
Cycling {B} ({B}, Discard this card: Draw a card.)

Create a 1/1 white Spirit creature token with flying. (Then exile this card. You may cast the artifact later from exile.)

When you cast this spell, copy it for each player that has 8 or less life. (The copies have the same target.)
Traitor's Execution deals 3 damage to target player.

Choose one —
• Each player skips their next combat step.
• Each opponent can't cast instant or sorcery spells this turn.

Destroy target creature with power or toughness 2 or less.

As long as an opponent has one or fewer cards in hand, Valdez gets +2/+0 and has menace.

First strike
Whenever a player loses life, creatures you control get +1/+0 until end of turn.

Choose a number. Reveal that many cards from the top of your library and put them into your hand. You lose life equal to the total mana value of those cards.

Eureka! (At the beginning of each end step, you get a research counter if you cast a spell this turn. Then if you have eight or more research counters, remove them and create a Masterpiece token of your choice.)
{T}: Draw a card, then discard a card.

Exile target creature or planeswalker. You gain 4 life.