msem-instigator

Hexproof
Whenever this creature transforms into Tsunami Titan or attacks, you may return target creature to its owner's hand.

Barbed Reef enters tapped. When it does, it explores. (Reveal the top card of your library. Put that card into your hand if it's a land. Otherwise, put a +1/+1 counter on this, then you may put that card into your graveyard.)
{T}: Add {B}.
{4}{B}: Barbed Reef becomes a Jellyfish creature. (This effect lasts indefinitely.)

When Frost Walker becomes the target of a spell or ability, sacrifice it.

Menace
Once during each of your turns, when you sacrifice a permanent, you may put a +1/+1 counter on Assimilated Runner.

Haste
Sacrifice another creature: Bygone Aristocrat gains indestructible until end of turn.

When Infectious Corpse dies, each player loses 2 life.

Enspirit (As you cast this spell, you may exile a nonenchantment creature you control until this leaves the battlefield or fails to resolve. Reduce this spell's cost by the exiled card's mana value.)
When Returned Bokor dies, return it to its owner's hand.

Menace
When Spaceship Invader enters, destroy target creature you don't control with mana value 3 or less.

At the beginning of your end step, you may sacrifice a permanent. When you do, return target creature card from your graveyard to your hand.

Mark (Whenever this creature attacks, mark target creature until end of turn.)
Undercity Diplomat can't be blocked by marked creatures.

When Undying Lich dies, create a 6/3 black Zombie Horror creature token with menace and “When this creature dies, create an 8/5 black Elder Demon Horror creature token with flying, deathtouch, and menace.”

Menace (This creature can't be blocked except by two or more creatures.)

When Anointed General enters, if you control a legendary creature, Anointed General deals 4 damage to target creature you don't control.

Haste
When Caravan Engulfer enters, creatures you don't control can't block this turn.

Haste
Winnow (Damage dealt to this creature also causes you to lose that much life.)

First strike, trample
{2}{R}, Sacrifice a land: Corrignos' Rage gets +3/+0 until end of turn.

When Flameboon Alchemist dies, you may put a +1/+1 counter on target creature you control.

Menagerie — When Lurking Feralynx enters, if there are five or more creature types among creatures you control, you may search your library for a card named Lurking Feralynx, reveal it, put it into your hand, then shuffle.

Haste
When Magma Crawler enters, creatures you control with flash or haste get +1/+1 until end of turn.

Motivate 1 (When this creature enters, you may motivate target creature with less power than this by putting a +1/+1 counter on it.)
When Merthilios' Escort motivates a creature, that creature gains first strike until end of turn.

Menace
Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Menace
Savage Stalker attacks each combat if able.

Flying, haste
Erratic (When this creature dies, reveal the top four cards of your library. Put a creature card that costs less than this revealed this way onto the battlefield and the rest on the bottom of your library in any order.)
When Splitflame Phoenix dies, you may pay {R}. If you do, return it to its owner's hand.

Haste
At the beginning of your end step, return Sunwatcher Aspirant to its owner's hand.

Defender