msem-instigator

You may pay {W}{U}{B}{R}{G} rather than pay this spell's mana cost.

Flash
Whenever Moonlit Hunter enters or you cast a noncreature spell, tap target permanent and untap a second target permanent.

At the beginning of combat on your turn, you may have Regurgitator Ooze consume. If you do, it gets +2/+2 until end of turn. (To consume, sacrifice another creature or exile a creature card from your graveyard.)
When Regurgitator Ooze dies, return a card exiled with it to its owner's hand.

Enchant opponent
Whenever enchanted player searches their library, you may search your library for a card, put it into your hand, then shuffle.

Whenever Savage Companion and another creature attack, if Savage Companion doesn't have first strike, put a first strike counter on it.

{T}: Add {C}.
{B}, {T}, Pay 2 life: Target player mills two cards.
At the beginning of your end step, if your life total is at least 13 less than your starting life total, you may pay {3}{B}{B} and exile this land. When you do, return target creature card from your graveyard to the battlefield.

Double strike
Whenever an opponent casts a noncreature spell, Riko, the Paragon deals 2 damage to that player.
Whenever a creature you control becomes blocked, untap it.

Whenever a creature you control is dealt damage, it gains indestructible until end of turn. (If it survives.)

Target player draws a card and loses 2 life, then discards three cards.

Destroy target artifact.

Target creature gets +1/+0 until end of turn. Add {R}.

Thriving Heath enters tapped.
As Thriving Heath enters, choose a color other than white.
{T}: Add {W} or one mana of the chosen color.

Whenever one or more creatures you control deal combat damage to a player or planeswalker, you draw a card and you lose 1 life.

Deathtouch
Inspired — Whenever Yenzu Nightblade becomes untapped, target creature you control gets +1/+1 and gains deathtouch until end of turn.

Creatures you control get -3/-3.
Whenever a creature you control dies, put a soul counter on Remake the Cast.
Creatures you control get +1/+1 for each soul counter on Remake the Cast.

When Quandary Seer enters, target player mills three cards. You shuffle up to three cards from your graveyard into your library.

Target opponent reveals their hand. You choose a creature or planeswalker card from it. That player discards that card.

When Almgrove Librarian enters, look at the top card of each of your libraries, then for each of those cards, put it on the top or bottom of one of your libraries.

At the beginning of your upkeep, you may discard a card. If you do, draw a card.
At the beginning of your end step, Choking Dunes deals X damage to any target, where X is the number of land cards in your graveyard.

{2}: Other creatures you control get +1/+0 until end of turn.
Whenever Sun-Crowned Flagship attacks, each attacking creature you control gains trample until end of turn.
Crew 7 (Tap any number of creatures you control with total power 7 or greater: This Vehicle becomes an artifact creature until end of turn.)

When Globule of Intuition enters or leaves the battlefield, scry 1. (To scry 1, look at the top card of your library. You may put that card on the bottom of your library.)
{2/U}, {T}, Sacrifice Globule of Intuition: Draw a card.

Create three 1/1 colorless Spirit creature tokens.

Marshy Vista enters tapped.
{T}: Add {B} or {R}.
{1}, {T}: Add one mana of any color.

When Imperial Artisan enters, draw three cards, then put two cards from your hand on top of your library in any order.

Motivate 1 (When this creature enters, you may motivate target creature with less power than this by putting a +1/+1 counter on it.)
{2}{W}{W}: Exile Valtrian Cavalier, then return it to the battlefield under your control.