Special Summon up to 2 "Crystal Beast" Monster Cards from your Spell & Trap Zone, and if you do, gain LP equal to their combined original ATK. If a "Crystal Beast" card(s) is placed in your Spell & Trap Zone while this card is in your GY, even during the Damage Step: You can banish this card; excavate the top card of your Deck, and if it is a "Crystal Beast" monster, either add it to your hand or Special Summon it. Otherwise, send that card to the GY. You can only use this effect of "Crystal Boon" once per turn.