Tibalt, the Fiend-Blooded

[+1]: Draw a card, then discard a card at random.
[−4]: Tibalt deals damage equal to the number of cards in target player's hand to that player.
[−6]: Gain control of all creatures until end of turn. Untap them. They gain haste until end of turn.

Secret Lair Drop

Duel Decks: Sorin vs. Tibalt

+1: Draw a card, then discard a card at random.
-4: Tibalt, the Fiend-Blooded deals damage equal to the number of cards in target player's hand to that player.
-6: Gain control of all creatures until end of turn. Untap them. They gain haste until end of turn.

Avacyn Restored

The number of cards in the target player's hand is determined when Tibalt's second ability resolves.

When Tibalt's third ability resolves, all creatures will become untapped and gain haste, including ones you controlled before the ability resolved.