msem-instigator

Rustshell Crustacean gets +1/+1 for each artifact you control.
Whenever Rustshell Crustacean attacks, choose one —
• Search your library for an Equipment card, reveal it, and put it into your hand, then shuffle.
• Create a Treasure token.

Counter target spell.

Flying
Whenever Eta, Experimental Doctor attacks, you may exile target card from a graveyard. If a creature card was exiled this way, put a +1/+1 counter on Eta and you gain 2 life.

Flying (This creature can't be blocked except by creatures with flying or reach.)
When Blood-Tithe Harpy enters, target player loses 1 life and you gain 1 life.

As an additional cost to cast Acid Sewage, reappropriate or pay {3}. (To reappropriate, exile exactly two cards from your hand and/or graveyard.)
Destroy target creature.

If a spell, ability, or creature an opponent controls would deal 4 or more damage to you or cause you to lose 4 or more life, you lose 4 life instead. (Damage won't be dealt.)

Foretell {2}{R} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)
Attacking creatures get +2/+0 until end of turn. If this spell was foretold, those creatures also gain trample until end of turn.

When Overgrowth Guardian enters, germinate. (Put a +1/+1 counter on a creature or create a 1/1 green Saproling creature token.)

{5}, {T}, Exile a creature you control: Exile target creature.

Target creature gets -1/-1 until end of turn. Create a 1/1 green Saproling creature token.

Equipped creature gets +2/+2 and has reach and protection from enchantment creatures. (It can't be blocked, targeted, or dealt damage by enchantment creatures.)
Equip {3}

Improve {R} ({R}: Put a +1/+1 counter on this creature. This costs {1} more to activate for each +1/+1 counter on it. Improve only as a sorcery.)
Whenever another creature you control with power less than or equal to Folkvar, Galdurheim Brawler's power attacks, Folkvar deals 1 damage to the player or planeswalker that creature is attacking and you gain 1 life.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)
{1}{U}, Discard Lusterwing Owl: Return target enchantment to its owner's hand.

{T}: Target player mills a card.
{2}, Sacrifice Gilded Cipher: Draw a card.

When Three Seas Squire enters, target creature or Vehicle gets +2/+1 until end of turn.

Sacrifice Scions of Old Jidai: Target player gains life equal to the life that player has lost this turn.

Dead Man's Hand enters tapped.
{T}, Sacrifice Dead Man's Hand, two permanents with mana value 1, and two permanents with mana value 8: Target player loses the game.

Whenever Angeltouched Dryad or another permanent you control is turned face up, add {C}{C}.
Morph {2} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)

Whenever you cast a noncreature spell, upgrade Embodied Soul. (Give it one of the listed counters it doesn't already have.)
• Flying
• First strike
• Vigilance
• Lifelink
{W}: Until end of turn, if Embodied Soul isn't a creature, it becomes a 0/0 Spirit Avatar enchantment creature with “This creature gets +1/+1 for each different kind of counter on it.”

Thalassic Borough enters tapped unless you have 15 or less life.
{T}: Add {U} or {B}.

{W}, {T}: Target attacking creature gets +1/+1 until end of turn. This ability costs {W} less to activate if it targets a Soldier.

Poisonous 2 (Whenever this creature deals combat damage to a player, that player gets two poison counters.)
Snakes you control get +1/+1 and have poisonous 1. (Multiple instances of poisonous trigger separately.)

Whenever you cast your second spell each turn, if it's an instant or sorcery spell, you may pay {1}{R}. If you do, gain control of target creature an opponent controls until end of turn. Untap that creature. It gains haste until end of turn.

When Master Chef enters, create a 0/1 green Plant creature token.
Sacrifice a Plant: You gain 3 life.

Exile target creature, then exile target creature card from a graveyard. An opponent chooses one of them. Put the chosen card onto the battlefield under your control.