Slumbering Titan

Secretkeep 0
{t}: Target player may put a card from their hand
face-down underneath Slumbering Titan. If they
do not, creatures they control cannot attack your
or planeswalkers you control this turn.
{u/b}, return 3 cards underneath Slumbering Titan
to their owner's hands: Slumbering Titan
becomes a 5/5 Construct creature until end of
turn. (It's still an artifact)