Aroma Gardening

If you Normal or Special Summon an "Aroma" monster(s) (except during the Damage Step): You can gain 1000 LP. When an opponent's monster declares an attack, while your LP are lower than your opponent's: You can Special Summon 1 "Aroma" monster from your Deck. You can only use each effect of "Aroma Gardening" once per turn.