This elegant combination takes advantage of Soulfire Grand Master's activated ability, which sets up a replacement effect to intercept an instant or sorcery as it resolves and bounce it straight back to your hand rather than the graveyard. By investing the necessary mana into that ability and then casting Time Warp, you ensure that the extra turn spell never actually leaves your hand permanently. Once Time Warp resolves and grants you that crucial extra turn, it returns safely to your grip, ready to be recast turn after turn.