msem-instigator

Reverberate {2}{R} (When you cast this spell, copy it if you paid its reverberate cost.)
Creatures your opponents control get -2/-0 until end of turn. If Unstable Experiment is reverberated, creatures you control get +1/+0 until end of turn.

{T}: Add {C}.
{T}, Sacrifice Alchemist's Abode and another permanent: Draw a card. Activate only during your turn.

Choose two —
• Return up to two target nonland permanents to their owner's hands.
• Any number of target players each sacrifice a creature.
• Any number of target players each sacrifice a planeswalker.
• Any number of target players each sacrifice an artifact or enchantment.

Enchant creature
When Child of the Pack enters, create a 2/2 green Wolf creature token.
Enchanted creature gets +1/+1 for each Wolf you control.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
When Weathered Veteran dies, you may put a -1/-1 counter on target creature.

Target creature gains lifelink until end of turn. (Damage dealt by that creature also causes you to gain that much life.)

Return target permanent to its owner's hand.

Exile target artifact, creature, or enchantment. If that permanent's mana value was 3 or greater, its controller may search their library for a basic land card, put it onto the battlefield tapped, then shuffle. (A transformed permanent retains the mana value of its front face.)

{2}, {T}, Sacrifice a creature: Each opponent loses 2 life. You gain life equal to the life lost this way.

When Mythos Scribe enters, you may return target storied card from your graveyard to your hand. (Enchantments and legendary permanents are storied.)

Flying
Ward—Pay 4 life. (Whenever this creature becomes the target of a spell or ability an opponent controls, counter it unless that player pays 4 life.)
Whenever you cast an instant spell, draw a card.
Whenever you cast a sorcery spell, Typhoon Terror deals 2 damage to any target.

Trample
Whenever a creature attacks, Alpha Stag gets +2/+2 until end of turn.

Lifelink
Whenever a creature enters from a graveyard, gain control of that creature.

Whenever Hadik's Striker is dealt damage, you gain that much life.

Lifelink
Whenever a planeswalker dies, Onya's Chosen deals 3 damage to target creature or player.

When Practiced Sorcerer enters, return target noncreature, nonland card from your graveyard to your hand.

Whenever a creature you control dies, create an Idol token. (It's an artifact with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Whenever you sacrifice a noncreature permanent, each opponent loses 1 life and you gain 1 life.

As Horizon of Origins enters, you may reveal an Island or Mountain card from your hand. If you don't, Horizon of Origins enters tapped.
{T}: Add {U} or {R}.

Flash
Enchant creature
When Ineffable Patronage enters, it deals 4 damage to up to one target attacking or blocking creature.
Enchanted creature gets +2/+2.

Enchant creature
Enchanted creature gets +3/+3 and has flying.

Whenever equipped creature attacks, exile target nonland permanent until Grab Bag leaves the battlefield.
Whenever equipped creature deals combat damage to a player, put a card exiled with Grab Bag onto the battlefield under your control.
Equip {3}

Whenever Canyon Mystic deals combat damage to a player, draw a card.

Defiance (Whenever this creature takes damage, if it survives and wasn't defiant, put a +1/+1 counter on it and it becomes defiant.)
At the beginning of your upkeep, if Elvish Songseeker has a +1/+1 counter on it, exile the top card of your library. Until your next turn, you may play that card.

Deception {B} ({B}, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Lifelink
{1}{B}: Nimunotian Shadow gets +1/+1 until end of turn.

At the beginning of each combat, if you control a creature with flying, Magnific Wilderkin gets +1/+1 and gains flying until end of turn. The same is true for first strike, double strike, deathtouch, haste, hexproof, indestructible, lifelink, menace, reach, trample, and vigilance.