Vaporkin

Flying
Vaporkin can block only creatures with flying.

Akroan Horse

Defender
When Akroan Horse enters the battlefield, an opponent gains control of it.
At the beginning of your upkeep, each opponent creates a 1/1 white Soldier creature token.

Nighthowler

Bestow (If you cast this card for its bestow cost, it’s an Aura spell with enchant creature. It becomes a creature again if it’s not attached to a creature.)
Nighthowler and enchanted creature each get +X/+X, where X is the number of creature cards in all graveyards.

Grim Return

Choose target creature card in a graveyard that was put there from the battlefield this turn. Put that card onto the battlefield under your control.

Pontiff of Blight

Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)
Other creatures you control have extort. (If a creature has multiple instances of extort, each triggers separately.)

Opal Lake Gatekeepers

When Opal Lake Gatekeepers enters the battlefield, if you control two or more Gates, you may draw a card.

Drown in Filth

Choose target creature. Mill four cards, then that creature gets -1/-1 until end of turn for each land card in your graveyard.

Debt to the Deathless

Each opponent loses two times X life. You gain life equal to the life lost this way.

Blind Obedience

Extort (Whenever you cast a spell, you may pay . If you do, each opponent loses 1 life and you gain that much life.)
Artifacts and creatures your opponents control enter the battlefield tapped.

Immortal Servitude

Return each creature card with converted mana cost X from your graveyard to the battlefield.

Tower Defense

Creatures you control get +0/+5 and gain reach until end of turn.

Growing Ranks

At the beginning of your upkeep, populate. (Create a token that’s a copy of a creature token you control.)

Hussar Patrol

Flash (You may cast this spell any time you could cast an instant.)
Vigilance

Vandalblast

Destroy target artifact you don’t control.
Overload (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of “target” with “each.”)

Attended Knight

First strike
When Attended Knight enters the battlefield, create a 1/1 white Soldier creature token.