
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

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

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