Rakdos the Defiler

Flying, trample
Whenever Rakdos the Defiler attacks, sacrifice half the non-Demon permanents you control, rounded up.
Whenever Rakdos deals combat damage to a player, that player sacrifices half the non-Demon permanents they control, rounded up.

Rakdos Augermage

First strike
: Reveal your hand and discard a card of target opponent’s choice. Then that player reveals their hand and discards a card of your choice. Activate this ability only any time you could cast a sorcery.

Soulsworn Jury

Defender (This creature can’t attack.)
, Sacrifice Soulsworn Jury: Counter target creature spell.

Grand Arbiter Augustin IV

White spells you cast cost less to cast.
Blue spells you cast cost less to cast.
Spells your opponents cast cost more to cast.

Electrolyze

Electrolyze deals 2 damage divided as you choose among one or two targets.
Draw a card.

Orzhov Euthanist

Haunt (When this creature dies, exile it haunting target creature.)
When Orzhov Euthanist enters the battlefield or the creature it haunts dies, destroy target creature that was dealt damage this turn.

Predatory Focus

You may have creatures you control assign their combat damage this turn as though they weren’t blocked.

Leyline of Singularity

If Leyline of Singularity is in your opening hand, you may begin the game with it on the battlefield.
All nonland permanents are legendary.

Electrolyze

Electrolyze deals 2 damage divided as you choose among one or two targets.
Draw a card.

Poisonbelly Ogre

Whenever another creature enters the battlefield, its controller loses 1 life.

Invoke the Firemind

Choose one —
• Draw X cards.
• Invoke the Firemind deals X damage to any target.

Golgari Guildmage

, Sacrifice a creature: Return target creature card from your graveyard to your hand.
: Put a +1/+1 counter on target creature.

Master Warcraft

Cast this spell only before attackers are declared.
You choose which creatures attack this turn.
You choose which creatures block this turn and how those creatures block.

Wojek Siren

Radiance — Target creature and each other creature that shares a color with it get +1/+1 until end of turn.

Glare of Subdual

Tap an untapped creature you control: Tap target artifact or creature.

Helldozer

, : Destroy target land. If that land was nonbasic, untap Helldozer.

Helldozer

, : Destroy target land. If that land was nonbasic, untap Helldozer.

Golgari Guildmage

, Sacrifice a creature: Return target creature card from your graveyard to your hand.
: Put a +1/+1 counter on target creature.

Soulsworn Jury

Defender (This creature can’t attack.)
, Sacrifice Soulsworn Jury: Counter target creature spell.

Golgari Guildmage

, Sacrifice a creature: Return target creature card from your graveyard to your hand.
: Put a +1/+1 counter on target creature.

Soulsworn Jury

Defender (This creature can’t attack.)
, Sacrifice Soulsworn Jury: Counter target creature spell.

Whitemane Lion

Flash (You may cast this spell any time you could cast an instant.)
When Whitemane Lion enters the battlefield, return a creature you control to its owner’s hand.