msem-instigator

Exile all cards from your graveyard. You may search your library for any number of instant and/or sorcery cards with different names that share a name with one or more cards exiled this way and cast them without paying their mana costs, then shuffle. Exile Infuse the Apparatus.

Hexproof
Whenever another creature you control becomes the target of a spell an opponent controls, you may submerge that creature. (To submerge a card, exile it, then put it on the battlefield face down under its owner's control as a 2/2 creature.)
{1}{U}{U}: Turn target face-down creature you control face up.

{3}, {T}: Put Ing'Wei's Crystal Top on top of your library. Scry 3, then draw a card.

[+1]: Look at the top two cards of your library. Put one of them into your hand and the other into your graveyard.
[–2]: Return target card from your graveyard to the battlefield face down.
[–6]: Turn any number of face-up nonland permanents of your choice face down.

{2}, {T}: Put a +1/+1 counter on target creature you control.
{2}, {T}, Sacrifice Inspiring Effigy: Put a +1/+1 counter on each creature you control.

Inspirited Duelist has double strike as long as it has a +1/+1 counter on it.

When Intrepid Shieldmate enters the battlefield, target creature gets +1/+1 until end of turn.

({T}: Add {U}.)
Inundated Sanctuary enters the battlefield tapped with two sanctum counters on it.
{T}, Remove a sanctum counter from Inundated Sanctuary: Add {W} or {B}.

Target opponent reveals cards from the top of their library until they reveal two instant and/or sorcery cards. Exile those cards, then that player shuffles the rest into their library. You may cast cards exiled this way until end of turn, and you may cast them without paying their mana costs.

Create two 2/2 blue Drake creature tokens with flying.
Metamorph {1}{U}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up and cast it at any time for its metamorph cost.)

You may put a green creature card with mana value 4 or less from your hand onto the battlefield.
Ferocious — If you control a creature with power 4 or greater, that creature enters the battlefield with two +1/+1 counters on it.

When Isle Conservator enters the battlefield, if you control a legendary creature, submerge target creature an opponent controls. (To submerge a card, exile it, then put it on the battlefield face down under its owner's control as a 2/2 creature.)

Menace
Whenever Issbarren Creeper deals combat damage to a player, draw a card, then discard a card.

Flying, haste
Dominance — At the beginning of combat on your turn, if you control the creature with the greatest power or tied for the greatest power, you may pay {1}{R}. If you do, return Issbarren Phoenix from your graveyard to the battlefield.

Flash
When Issbarren Warden enters the battlefield, exile target token.

Counter target creature spell or target spell that targets a creature an opponent controls.

Reach
Whenever another creature you control becomes the target of an instant or sorcery spell, that creature gets +3/+3 until end of turn.

Players play with the top card of their libraries revealed.
At the beginning of your precombat main phase, add {G}{G} for each land card among cards on top of libraries.
Jindao, the Coiled Prophet gets +2/+2 for each creature card among cards on top of libraries.

Creatures you control get +1/+1 and gain flying and lifelink until end of turn.

Enchant creature
When Join the Pack enters the battlefield, create a 2/2 green Wolf creature token.
Enchanted creature gets +2/+2.

Juvenile Boa gets +2/+0 as long as you control a legendary creature.

Flying
When Kai'Dwo, Eternal Ravager enters the battlefield, create seven Idol tokens. (They're artifacts with “{1}, Sacrifice this artifact: Put a +1/+1 counter on target creature. Activate only as a sorcery.”)
Whenever you sacrifice an Idol, each opponent sacrifices a creature.

Flying, trample
At the beginning of your upkeep, sacrifice a creature.
Revive {2}{B}{B} ({2}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)

Flying
Whenever a creature you control dies, each opponent loses life equal to its power.