Corpse Harvester

, , Sacrifice a creature: Search your library for a Zombie card and a Swamp card, reveal them, and put them into your hand. Then shuffle your library.

Keldon Champion

Haste
Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When Keldon Champion enters the battlefield, it deals 3 damage to target player or planeswalker.

Forgotten Ancient

Whenever a player casts a spell, you may put a +1/+1 counter on Forgotten Ancient.
At the beginning of your upkeep, you may move any number of +1/+1 counters from Forgotten Ancient onto other creatures.

Browbeat

Any player may have Browbeat deal 5 damage to them. If no one does, target player draws three cards.

Mind Control

Enchant creature
You control enchanted creature.

Nemesis of Reason

Whenever Nemesis of Reason attacks, defending player mills ten cards.

Grixis Illusionist

: Target land you control becomes the basic land type of your choice until end of turn.

Minion Reflector

Whenever a nontoken creature enters the battlefield under your control, you may pay . If you do, create a token that’s a copy of that creature, except it has haste and “At the beginning of the end step, sacrifice this permanent.”

Deep Spawn

Trample
At the beginning of your upkeep, sacrifice Deep Spawn unless you mill two cards.
: Deep Spawn gains shroud until end of turn and doesn’t untap during your next untap step. Tap Deep Spawn. (A creature with shroud can’t be the target of spells or abilities.)

Phyrexian Devourer

When Phyrexian Devourer’s power is 7 or greater, sacrifice it.
Exile the top card of your library: Put X +1/+1 counters on Phyrexian Devourer, where X is the exiled card’s converted mana cost.

Retribution

Choose two target creatures an opponent controls. That player chooses and sacrifices one of those creatures. Put a -1/-1 counter on the other.