msem-instigator

When Stalwart Physicker enters, you may remove a -1/-1 counter from target creature.

Destroy target artifact or enchantment. Scry 2.

{G}, {T}: Add {C}{C}.

Sabotage — Whenever an opponent or permanent an opponent controls becomes the target of a spell you control, Iken Troubleshooter deals 2 damage to each opponent.

Forgotten Consequences deals 2 damage to target attacking or blocking creature.

Each instant and sorcery card in your graveyard has reprise. The reprise cost is equal to its mana cost. (As you cast an instant or sorcery spell, you may exile one card with reprise from your graveyard and pay its reprise cost. If you do, add its effects to that spell.)
Reprising spells you control can't be countered.

Lifelink
Whenever you gain life, you may transform Hopeful Caretaker. If you don't, put a +1/+1 counter on it.

Flying, haste
Whenever Vidal's Conjurant attacks, reveal the top six cards of your library. You may put an enchantment card with mana value 3 or less from among them onto the battlefield. If you do, sacrifice that enchantment at the beginning of the next end step. Put the rest on the bottom of your library in a random order.

Enchant player
At the beginning of each end step, create X 1/1 green Snake creature tokens, where X is the amount of life enchanted player lost this turn.

Target creature you control gets +4/+0 and gains trample until end of turn.

Engorge (As this enters, mill three cards, then exile a card from among the milled cards.)
When Bloodchill Risen enters, if it engorged an instant card, return target creature to its owner's hand.

As Scavenging Sandwurm enters, choose decay or remain.
When Scavenging Sandwurm dies,
• Decay — Draw a card.
• Remain — Create a 2/2 black Zombie creature token.

{T}, Discard your hand: If two or more cards were discarded this way, search your library for a card and put that card into your hand, then shuffle.

When Ulvenwald Ranger enters, surveil 2. (Look at the top two cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.)
{1}{G}: Transform Ulvenwald Ranger. Activate only if it's attacking.

First strike
Sacrifice Echo Striker: Target creature gains double strike until end of turn.

When Lotus Wastes Survivalist enters, target player discards a card. Create a Treasure token unless a nonland card was discarded this way.

Haste
Whenever a player loses life, that player gains control of Graygulch Revenant.

Inquirer, Roaming Rover attacks each combat if able.
Whenever Inquirer deals damage to an opponent, draw a card.

As an additional cost to cast this spell, you may pay {2} and tap an untapped Rogue you control. When you do, copy this spell and you may choose new targets for the copy.
Target creature gets -2/-2 until end of turn.

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

Prismatic — Whenever you cast a multicolored spell, Thorny Bushwacker has base power and toughness 5/3 until end of turn.

[+1]: Create a 1/1 blue Merfolk creature token with “When this creature dies, draw a card, then discard a card.”
[–1]: Target creature gets -2/-0 until your next upkeep and attacks during its controller's next turn if able.
[–7]: You get an emblem with “Creatures your opponents control get -4/-0 and attack each turn if able.”

This spell costs {2} less to cast if there's a storied card in your graveyard. (Enchantments and legendary cards are storied.)
Search your library for a storied card, reveal it, put it into your hand, then shuffle.

Tap target creature. If you control a Monk, draw a card. (Then exile this card. You may cast the creature later from exile.)

Other Angels and Nephilim you control get +1/+0.
{3}{W}: Until end of turn, Hooded Mystic becomes an Angel, gets +3/+3 and gains flying.