Now You See Me . . . 
Instant
Exile target creature you control, then return it to the battlefield under its owner's control with X +1/+1 counters on it, where X is the number of mirrors on walls you can see from your seat.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL