Mystical Pocket Watch

Protection from lands
Whenever Mystical Pocket Watch enters the
battlefield, gain control of target X historic
spell(s). Whenever a historic spell you control
leaves the battlefield, you may pay 2 life,
exile it instead.
{7}{t}: Target creature has +7/+7 and Hexproof
until end of turn. Then if you 5 or less life, you
win the game.