Supreme Heavenly Emperor Dragon, Defeat Flare Dragon

(Usable when both fighters' vanguards are grade 3 or greater, and the number of face up G guardians in your G zone is three or less)-Opponent Turn's Guard Step-[Choose a card with "[Heal] Heal" from your hand, and discard it] Call this card to your from face down. :[ 1 & Choose two grade 3 or greater Flame Dragon from your drop zone, and put them on the bottom of your deck in any order] When this unit is placed on during the battle your vanguard with "Overlord" in its card name is attacked by your opponent's vanguard, you may pay the cost. If you do, retire all of the rear-guards in your opponent's back row.