Continuous. During your Main Phase, you can Normal Summon 1 "Crystal Beast" monster in addition to your Normal Summon/Set. (You can only gain this effect once per turn.) You can only use the following effects of "Bridge of the Heart" once per turn. During your Main Phase: You can destroy 1 "Crystal Beast" card you control or in your hand, and if you do, add 1 "Crystal" Spell/Trap from your Deck to your hand. If a "Crystal Beast" card(s) is placed in your Spell & Trap Zone (even during the Damage Step): You can target 1 card your opponent controls; return it and this card to the hand.