Vernusylph Corolla (POTE-EN061) - Power of the Elements Unlimited

All EARTH monsters you control are also treated as "Vernusylph" monsters. Once per turn, if you would discard a "Vernusylph" monster(s) and 1 card to activate the effect of that "Vernusylph" monster in your hand, you can discard only that "Vernusylph" monster(s) instead.