This delightful loop creates a self-sustaining security blanket where Lullmage Mentor does double duty as both the counterspell engine and the token producer. When you tap out your Merfolk army to counter an opponent's spell, Lullmage Mentor's triggered ability tries to reward you with a single Merfolk token, but your token-doubling effects—Parallel Lives, Primal Vigor, and Exalted Sunborn—all stack together to multiply that single creation into an explosive surge of eight new bodies. Because those newly minted Merfolk enter untapped, you immediately have the exact quorum of seven required to activate Lullmage Mentor all over again whenever the next threat hits the stack.