msem-instigator

Flying

Slipstream (This creature can't be blocked as long as only creatures with slipstream are attacking.)
{4}{B}{B}, {T}, Sacrifice Abalone Abomination: Create an X/X black Horror creature token, where X is the number of cards in your graveyard.

This spell costs {X} less to cast, where X is the greatest power among creatures you control.
Abandon Life and Hope deals 5 damage to target creature or planeswalker.

As an additional cost to cast this spell, discard a card.
Draw two cards. Forebode. (Create a tapped colorless Omen artifact token with “{T}, Discard a card, Sacrifice this artifact: Draw a card.”)

Counter target spell. If that spell is countered this way, put it on the bottom of its owner's library instead of putting it into its owner's graveyard. You may put up to three target cards from your graveyard on the bottom of your library in any order.

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

{T}: Add {C}.
{3}, {T}, Sacrifice Abandoned Sanctuary: Search your library for a land card with a basic land type and put it onto the battlefield tapped, then shuffle.

When Abberant Frostbringer enters, tap up to one target creature. If you do, put two stun counters on that creature. (If a permanent with a stun counter would become untapped, remove one from it instead.)

Engorge (As this enters, mill three cards, then exile a card from among the milled cards.)
When Abhorrent Exhumer enters, if it engorged a creature card, you may return target creature card from your graveyard to your hand.

Put a +1/+1 counter on target creature. Prevent all combat damage other creatures would deal this turn.

Trample
Whenever another Horror you control enters, put a +1/+1 counter on Abominable Xenoflora.

Destroy target creature with power 4 or greater. You gain 2 life.

When Abomination Broodmother dies, create a 3/2 green Horror creature token.

When Abomination Emissary enters, target player mills six cards.

Abomination Sculptor has deathtouch and lifelink as long as it's attacking.

Whenever you make first contact, Abrasive Citizen gets +3/+0 until end of turn. (You make first contact the first time each turn you cast a spell with a name not in your graveyard or control already.)

Destroy target artifact or land.

Exile up to one target card from a graveyard. If you do, create a 1/1 green Spirit creature token.
Coalesce {7}{G} (You may cast this from your graveyard for {7}{G}. If you do, it enters as a Horror creature after it resolves. Exile it if it would leave the battlefield or not resolve.)

Search your library for a basic land card and put it onto the battlefield tapped, then shuffle. You gain 1 life for each land you control.

When Abura-no-Oni enters, target player mills two cards.

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
Cycling {G} ({G}, Discard this card: Draw a card.)

Haste
Disgraced 1 (This enters with a -1/-1 counter. Whenever it deals combat damage to a player, remove all -1/-1 counters from it.)

Abyssal Crypt enters tapped.
{T}: Add {U} or {B}.
{2}{U}{B}, {T}, Sacrifice Abyssal Crypt: Draw a card.

Draw three cards. Discard two cards at the beginning of the next end step.

Exile target creature or planeswalker and up to one target card from its controller's graveyard.