msem-instigator

When Coralight Paladin enters, you may search your library for an artifact card, reveal it, then shuffle and put that card on top.
Concord — Whenever Coralight Paladin attacks, if there are four or more card types among permanents you control, Merfolk you control get +1/+1 until end of turn.

Lost Explorer has first strike as long as it's attacking.
{1}{B}, Exile Lost Explorer from your graveyard: Crystallize. (Put a +1/+1 counter on a creature you control or create a Treasure.)

This spell costs {2} less to cast if its target has the same name as a card in a graveyard.
Scoff deals 3 damage to any target.

[+2]: Put two +1/+1 counters or loyalty counters on up to one other target creature or planeswalker.
[0]: Cornrose, the Mighty deals 3 damage to target creature. That creature deals damage equal to its power to Cornrose.
[–2]: Until end of turn, target creature gets +X/+X and gains trample, where X is its power.

Target player shuffles any number of target cards from their graveyard into their library.
Draw a card.

Whenever you cast your first instant or sorcery spell each turn, untap equipped creature.
Equip {1}

Flash
Flying
Whenever a player discards a card, you draw a card. This ability triggers only once each turn.

{1}{W}: Exile Furtive Witch. If you do, exile another target nonland permanent. Return both of those cards to the battlefield at the beginning of the next end step under their owners' control.

Up to two target creatures you control each get +1/+0 and gain menace until end of turn.

Charred Marsh enters tapped unless you control a Mountain.
{T}: Add {B} or {G}.

When Gilded Merrow enters, if an opponent controls more lands than you, create a Treasure token. (It's an artifact with “{T}, Sacrifice this permanent: Add one mana of any color.”)

When Blessed Spellroot dies, you gain 5 life.

Crew 3 (Tap any number of creatures you control with total power 3 or greater: This Vehicle becomes an artifact creature until end of turn.)

At the beginning of combat on your turn, target creature you control with flying gets +1/+1 until end of turn.

{T}: Add {C}.
{T}, Reappropriate: Add {W} or {B}. (Exile exactly two cards from your hand and/or graveyard.)

Mill three cards. You may return a card milled this way to your hand. Each opponent loses 2 life.
Flashback {3}{B} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Haste
Whenever Weary Sentinel attacks, you may pay {2}{R}{W}. If you do, it gets +2/+0 and gains first strike until end of turn.

{1}, Sacrifice a creature: Create a Treasure token. Exile the top card of your library. You may play that card this turn.

Flying
When Rimecraft Owl enters, you may put an Aura card with mana value 3 or less from your hand or graveyard onto the battlefield attached to Rimecraft Owl or target creature an opponent controls that Aura could enchant.

Choose one or both —
• Put target detained creature on top of its owner's library.
• Detain target creature. (Until your next turn, that creature can't attack or block and its activated abilities can't be activated.)

This spell can't be countered.
Haste
Whenever a creature dealt damage by Ripper of the Fang Den this turn dies, put X +1/+1 counters on Ripper, where X is his power.

Enchant land
Enchanted land has “{W}, {T}: You gain 2 life.”

When Kill This Love enters, target opponent sacrifices a creature.
At the beginning of each end step, if a creature died this turn, you gain 2 life.

Flying, haste
Whenever Ma'Long deals combat damage to a player, draw a card, then add that much mana in any combination of {U} and/or {R}. Until end of turn, you don't lose this mana as steps and phases end.
Instant and sorcery cards in your hand have showcase. The showcase cost is equal to the card's mana cost plus {2}. (If you cast it for its showcase cost, create a 1/1 red Bard creature token that can't block and exile that card. Whenever the Bard attacks, you may cast a free copy of the exiled card.)

Put a +1/+1 counter on target creature. That creature gains flying until end of turn. Untap it.