msem-instigator

Vigilance
When Kahroba Champion enters, creatures you control get +1/+1 until end of turn.

When Mourners of Mervin enters, you may sacrifice a creature or enchantment. If you do, creatures you control get +1/+1 and gain vigilance until end of turn.

Flying
Morph {5}{W}{W} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
When you turn Pinnacle Seraph face up, destroy all other creatures.

Flying

When Virtue of Propriety enters, return target creature card with mana value 3 or less from your graveyard to your hand.

When Benthic Shipcrasher enters, scry 3.

{1}, Exile Coiling Mystic from your graveyard: Investigate. (Create a colorless Clue artifact token with “{2}, Sacrifice this artifact: Draw a card.”)

Defender
Sacrifice two Islands: Deepsea Denizen loses defender until end of turn.

Colossal 4—{5}{U}{U}{U} (You may cast this for its colossal cost to have it enter with four +1/+1 counters; or pay {5}{U}{U}{U} as a sorcery: Put four +1/+1 counters on it if it has none.)
Whenever Megalokraken enters or attacks, reveal the top X cards of your library, where X is Megalokraken's power. You may cast a noncreature spell with mana value X or less from among them without paying its mana cost. Put the rest on the bottom of your library in a random order.

This spell can't be countered.
{U}: Exile Skulkling. Return it to the battlefield under its owner's control at the beginning of the next end step.
{1}{U}: Until end of turn, Skulkling gets +1/-1 and can't be blocked.
{3}{U}: Draw a card. Create a 1/1 blue Rogue creature token.

Bloodprice {2}{U} (You may cast this card by sacrificing a creature and paying its bloodprice.)

You may cast spells from among cards you put into your graveyard from your library this turn.
Whenever one or more cards leave your graveyard, create a tapped 2/2 black Zombie creature token.
When Stitched Gargantua is put into your graveyard from your library, you may return it to your hand.

Defender
Territorial Fangwurm may attack as though it didn't have defender as long as you've cast a cryptic spell this turn. (Artifacts, enchantments, and modal spells are cryptic.)

When this creature enters, return a creature you control to its owner's hand.
{2}{U}: This creature gets +2/-2 until end of turn.

Once each turn, when a creature you control becomes tapped, you may untap that creature and tap up to one target creature.

When Titou Louoe, Bayou Shaman enters, create a blue Aura Curse enchantment token named Curse of Impotence attached to target player. The token has enchant player and “Creatures enchanted player controls get -1/-0.”

When Volaris Tideshaper enters, look at the top four cards of your library. Put one of those cards into your hand. and the rest on the bottom of your library in a random order.
Whenever you cast a noncreature spell, Volaris Tideshaper can't be blocked this turn.

Distorted (This creature can be blocked by tapped creatures but not untapped creatures.)

Flying
Cycling {2} ({2}, Discard this card: Draw a card.)

Civilized — Adorned Naga gets +2/+0 and has menace as long as you control an artifact, a creature, and an enchantment.

When CySec Spectre enters, you may sacrifice a creature. If you do, target opponent loses 3 life and you gain 3 life.

Tribute 2 (As this creature enters, an opponent of your choice may put two +1/+1 counters on it.)
At the beginning of your upkeep you lose life equal to the number of +1/+1 counters on Descendant of Caaseb.

Golden age (If you cast an instant or sorcery spell, activated a nonmana ability, and attacked this turn, enter a renaissance for this game.)
Sacrifice another creature: Grotesque Defiler gains flying until end of turn.
Whenever Grotesque Defiler deals combat damage to a player, if you're in a renaissance, that player discards a card.

Indestructible
{2}{B}, Exile two cards from your graveyard: Each opponent loses 2 life and you gain 2 life.