Twitch, the Plague Rat

Skulk, haste
Whenever Twitch, the Plague Rat deals combat damage to a player, choose any number —
• Each player discards their hand, then draws four cards. Activate this ability only if Twitch attacked the player with the most cards in hand.
• Each player sacrifices half the creatures they control, rounded down. Activate this ability only if Twitch attacked the player with the most creatures on the battlefield.