Lightforce Sword

Flash, hexproof

Vanishing 4 (This enchantment enters the battlefield
with four time counters on it. At the beginning of
your upkeep, remove a time counter from it. When the
last is removed, sacrifice it.)

Choose target opponent, exile a card at random
from their hand face down. When Lightforce Sword
is put into a graveyard from the battlefield, return
the exiled card to their owner's hand.