Hiyda, the Mad Witch

Haste: Hiyda can attack and tap as soon as she enters the battlefield.
Rage Unleashed: Whenever Hiyda attacks, deal 3 damage to any target, and each player sacrifices a creature.
Frenzied Wrath: At the beginning of your upkeep, discard a card at random. If a nonland card is discarded this way, Hiyda gains +2/+0 until end of turn.
Unstable Fury: When Hiyda dies, each opponent loses 2 life and you draw a card.