When your "Troop Dragon" is destroyed as a result of battle you can Special Summon a "Troop Dragon" from your Deck. This way you can keep monsters on the field even when your opponent attacks. Once you are able to successfully Tribute Summon "Tyrant Dragon", activate "Super Rejuvenation". It is a Spell Card that allows you to draw a card for every Dragon-Type monster you Tributed that turn, so you will draw 2 new cards!