
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

Kraven, Proud Predator | Legendary Creature | Human Warrior Villain | Vigilance
Top of the Food Chain — Kraven's power is equal to the greatest mana value among permanents you control. | Inkognit

Rhino's Rampage | Sorcery | | Target creature you control gets +1/+0 until end of turn. It fights target creature an opponent controls. When excess damage is dealt to the creature an opponent controls this way, destroy up to one target noncreature artifact with mana value 3 or less. | Gonzalo Kenny

Rhino, Barreling Brute | Legendary Creature | Human Villain | Vigilance, trample, haste
Whenever Rhino attacks, if you've cast a spell with mana value 4 or greater this turn, draw a card. | Inkognit