820.1.d. Repeat is functionally short for “You may pay [Cost] as an additional cost as you play this spell. If you do, execute the instructions of this spell one additional time.” 820.1.d.1. When the additional cost is paid, the effect of the spell, upon resolution, will be performed an additional time. Example: Desert’s Call is a spell with [Repeat] [2] and “Play a 2 [S] Sand Soldier unit token.” If its controller pays its Repeat cost as they play it, the card’s instruction to play a Sand Soldier is executed twice, as though the card says “Play a 2 [S] Sand Soldier unit token. Play a 2 [S] Sand Soldier unit token.”