Kulrath Knight

Flying
Wither (This deals damage to creatures in the form of -1/-1 counters.)
Creatures your opponents control with counters on them can’t attack or block.

Spawnwrithe

Trample
Whenever Spawnwrithe deals combat damage to a player, create a token that’s a copy of Spawnwrithe.

Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.

Bog Wraith

Swampwalk (This creature can’t be blocked as long as defending player controls a Swamp.)

Bog Wraith

Swampwalk (This creature can’t be blocked as long as defending player controls a Swamp.)

Bitter Ordeal

Search target player’s library for a card and exile it. Then that player shuffles.
Gravestorm (When you cast this spell, copy it for each permanent put into a graveyard this turn. You may choose new targets for the copies.)

Korlash, Heir to Blackblade

Korlash, Heir to Blackblade’s power and toughness are each equal to the number of Swamps you control.
: Regenerate Korlash.
Grandeur — Discard another card named Korlash, Heir to Blackblade: Search your library for up to two Swamp cards, put them onto the battlefield tapped, then shuffle.

Grave Peril

When a nonblack creature enters, sacrifice Grave Peril. If you do, destroy that creature.