
Shriek, Treblemaker | Legendary Creature | Mutant Villain | At the beginning of your first main phase, you may discard a card. When you do, target creature can't block this turn.
Sonic Blast — Whenever a creature an opponent controls dies, Shriek deals 1 damage to that player. | Billy Christian

Carnage, Crimson Chaos | Legendary Creature | Symbiote Villain | Trample
When Carnage enters, return target creature card with mana value 3 or less from your graveyard to the battlefield. It gains "This creature attacks each combat if able" and "When this creature deals combat damage to a player, sacrifice it."
Mayhem {B}{R} | Diana Franco

Scarlet Spider, Kaine | Legendary Creature | Spider Human Hero | Menace (This creature can't be blocked except by two or more creatures.)
When Scarlet Spider enters, you may discard a card. If you do, put a +1/+1 counter on him.
Mayhem {B/R} (You may cast this card from your graveyard for {B/R} if you discarded it this turn. Timing rules still apply.) | Alexander Mokhov

Pumpkin Bombardment | Sorcery | | As an additional cost to cast this spell, discard a card or pay {2}.
Pumpkin Bombardment deals 3 damage to target creature. | Javier Charro

Green Goblin, Revenant | Legendary Creature | Goblin Human Villain | Flying, deathtouch
Whenever Green Goblin attacks, discard a card. Then draw a card for each card you've discarded this turn. | Daren Bader

Ultimate Green Goblin | Legendary Creature | Goblin Villain | At the beginning of your upkeep, discard a card, then create a Treasure token.
Mayhem {2}{B/R} (You may cast this card from your graveyard for {2}{B/R} if you discarded it this turn. Timing rules still apply.) | Caio Cacau

Cosmic Spider-Man | Legendary Creature | Spider Human Hero | Flying, first strike, trample, lifelink, haste
At the beginning of combat on your turn, other Spiders you control gain flying, first strike, trample, lifelink, and haste until end of turn. | Jesper Ejsing