Mental Tuner (MP24-EN310) [25th Anniversary Tin: Dueling Mirrors]

You can activate 1 of these effects;<br>• Banish up to 1 LIGHT and up to 1 DARK monster from your hand and/or GY; increase or decrease this card's Level by the exact number banished, until the end of this turn.<br>• Target up to 2 of your banished monsters (1 LIGHT and/or 1 DARK); return them to the GY, and if you do, increase or decrease this card's Level by the exact number returned, until the end of this turn.<br>You can only use this effect of "Mental Tuner" once per turn.