You may always choose a target creature card in your graveyard, even if you don’t control a creature with power 4 or greater. Whether you return the creature card is determined only as Clear the Stage resolves.
2019-01-25
You check whether you control a creature with power 4 or greater after the target creature gets -3/-3 but before it dies, if appropriate.
Target creature gets -3/-3 until end of turn. If you control a creature with power 4 or greater, you may return up to one target creature card from your graveyard to your hand.
You can’t cast Clear the Stage without a target creature to get -3/-3. If either target is illegal when Clear the Stage tries to resolve, the other is still affected as appropriate.
