Protective Stone Gardenscaping

While you have 5 cards in your Spell & Trap Zone, any battle damage a player takes is halved, also once per turn, you can activate 1 Continuous Trap Card the turn it was Set. During the Standby Phase: You can reveal 5 Continuous Traps with different names from your Deck, your opponent randomly picks 1 for you to Set on your field, also shuffle the rest into the Deck. You can only use this effect of "Protective Stone Gardenscaping" once per turn.