Generaider Boss Bite (MYFI-EN039) - Mystic Fighters 1st Edition

Tribute any number of "Generaider" monsters, then target 1 face-up Xyz Monster you control; attach exactly that many "Generaider" monsters from your hand, field, and/or GY to it, except the monsters Tributed to activate this effect. You can only activate 1 "Generaider Boss Bite" per turn.