Swamp

Priest of Gix

When Priest of Gix enters, add {B}{B}{B}.

As an additional cost to cast this spell, exile X cards from your graveyard.
You draw X cards and you lose X life.

Shadow (This creature can block or be blocked by only creatures with shadow.)
Dauthi Slayer attacks each combat if able.

Return target creature card with mana value 3 or less from your graveyard to the battlefield.
Cycling {2} ({2}, Discard this card: Draw a card.)

Destroy target nonblack creature. It can't be regenerated. You lose life equal to that creature's toughness.

Target player sacrifices a creature of their choice.

Target opponent reveals their hand. You choose a noncreature, nonland card from it. That player discards that card.

{B}: Nantuko Shade gets +1/+1 until end of turn.

Flying
Whenever Hypnotic Specter deals damage to an opponent, that player discards a card at random.

Shadow (This creature can block or be blocked by only creatures with shadow.)
Dauthi Horror can't be blocked by white creatures.