msem-instigator

When Recruits of the Demeter enters, draw a card if you control another Pirate.

Redgill Corsair gets +1/+0 as long as you control an artifact.
When Redgill Corsair dies, create a Treasure token.

Whenever you draw a card, put a hatch counter on Reefcrown Egg.
{T}, Sacrifice Reefcrown Egg: You may put a creature card with mana value less than or equal to the number of hatch counters on Reefcrown Egg from your hand onto the battlefield.
Cycling {2} ({2}, Discard this card: Draw a card.)

Return target creature you own to your hand.
Scry 1.

Choose two —
• You gain 3 life.
• Tap target creature.
• Put a +1/+1 counter on target creature.

Whenever a creature dealt damage by Rei's Betrayer this turn dies, you gain life equal to that creature's toughness.

Rei, the Supplanter gets +1/+1 for each Forest you control.
At the beginning of each player's end step, if that player didn't play a land this turn, create a Forest token.

Whenever a creature you control perseveres this turn, you gain 3 life. (A creature perseveres when it survives damage.)

Glitch {2} (Remove one [restriction] for each time you pay the glitch cost.)
Destroy target artifact or enchantment [with mana value 3 or less].

[+1]: Create a 1/1 blue Elemental creature token with flying, then crystallize twice. (Put a +1/+1 counter on a creature you control or create a Treasure.)
[–3]: Exile target nonland permanent. As long as it's exiled, its owner may pay {W}{U}{B}{R}{G} as a sorcery to put it into their hand.
[–7]: You get an emblem with “Pay 1 life: Add one mana of any color.” Then you gain 100 life.

{T}: Target player exiles a card from their graveyard.
{2}, Sacrifice Remnant of Past Realities: Exile each opponent's graveyard. Draw a card.

Rend deals 1 damage to any target and you gain 1 life.
Whenever you cast a black spell, you may pay {1} and exile Rend from your graveyard. If you do, destroy target creature or planeswalker if it was dealt damage this turn.

Whenever a creature enters, each opponent loses 1 life.

{T}, Sacrifice Renewal Grove: Search your library for a basic land card, put it onto the battlefield, then shuffle. If Renewal Grove entered since your last upkeep, that land doesn't untap during your next untap step.

Whenever another creature you control is dealt damage, put a +1/+1 counter on it. If you do, upgrade Renowned Healer. (Give it one of the listed counters it doesn't already have. The damaged creature must survive to get the counter.)
• +1/+1
• Flying
• Lifelink

Whenever a creature dies, put a +1/+1 counter on Repository of Thoughts.
At the beginning of each combat, you may move a counter from Repository of Thoughts to target creature.

Repurposed Construct enters tapped.
{T}: Add {B} or {G}.
{B}{G}, {T}, Sacrifice Repurposed Construct: Conjure a card named Data-Point into your hand. (It's a sorcery that costs {2} with “Draw a card.”)

Sacrifice Repurposed Killdrone: It deals 1 damage to any target. You gain 1 life.

{2}, Sacrifice Research Aquarium: Draw a card.
When Research Aquarium is put into a graveyard from the battlefield, investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

{1}: Exile target card from a graveyard.
At the beginning of combat on your turn, if there are three or more card types among cards exiled with Respectful Tracker, put a +1/+1 counter on target creature you control.

({T}: Add {G} or {W}.)
Whenever Resplendent Substratum becomes tapped, you lose 1 life unless you control two or more basic lands.

{W}, {T}: Tap target creature.

Enchant creature
Enchanted creature gets +2/+2 and attacks each turn if able.

At the beginning of your end step, put a creature card that's exiled with this enchantment onto the battlefield under your control. That creature becomes a 1/1 Spirit creature in addition to its other types and gains flying and “If this creature would die, put it on the bottom of its owner's library instead.”

Restored Automaton enters with X +1/+1 counters on it.
Mentor (Whenever this creature attacks, put a +1/+1 counter on target attacking creature with lesser power.)