You can only use each effect of 'Merlin' once per turn. ● You can Tribute this card; Special Summon 1 'Noble Knight' monster from your Deck. You cannot Special Summon monsters the turn you activate this effect, except 'Noble Knight' monsters. ● During either player's turn: You can banish this card from your Graveyard; immediately after this effect resolves, Synchro Summon 1 'Noble Knight' Synchro Monster using monsters you control. ● During either player's turn: You can banish this card from your Graveyard; immediately after this effect resolves, Xyz Summon 1 'Noble Knight' Xyz Monster using monsters you control.