Therion Battle Royale

You can use this Skill's first and second effects once per Duel if your Deck (excluding the Extra Deck) contains 15 or more "Therion" cards. 1: Reveal 1 "Therion" monster in your hand. Add 1 "Therion" card from your Deck to your hand or send it to the GY. Then, add 1 "Endless Engine Argyro System" from outside of your Deck to your hand. 2: If your opponent controls a card, add 1 "Therion" monster from your Deck to your hand, then send up to 3 "Therion" cards from your Deck to the GY.