Opal Lake Gatekeepers

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

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.)

Tower Defense

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

Immortal Servitude

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

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 tapped.

Growing Ranks

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

Vandalblast

Destroy target artifact you don’t control.
Overload (You may cast this spell for its overload cost. If you do, change “target” in its text to “each.”)

Hussar Patrol

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

Attended Knight

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