Large Wheel of the Cosmos, Cosmo Wreath

-Opponent Turn's Guard Step-[Choose a card with "[Heal] Heal" from your hand, and discard it] Call this card to your from face down. : 1 When this unit is placed on , you may pay the cost. If you do, your opponent chooses a rear-guard in his or her back row, and locks it. If he or she does, this unit gets +5000 until end of that battle.