Timestopper Scientist

Automatic {u}{r} (If you pay an automatic cost, this
card enters the battlefield face-down. It is 2/2 if is a creature card. If you tap land equal to this card mana
cost, face-up)
When Timestopper Scientist face down, it have
hexproof.
{3}{u}{r}: You get extra turn. Spends this mana if Timestopper Scientist is face up and during
opposite turn.