Ambient Silence, Etosha

:Sentinel /:Harmony :[Choose three cards with the harmony ability from your drop zone, and return them to your deck] When this unit is placed on from hand, you may pay the cost. If you do, shuffle your deck, and call five cards from the top of your deck to . : 1 At the end of the battle that this unit boosted ([Boost]), if this unit is in harmony, you may pay the cost. If you do, return this unit to your hand.