Éphémère
Vous gagnez 1 point de vie pour chaque créature en jeu. Si

a été dépensé pour jouer la Caresse selon la dryade, dégagez toutes les créatures que vous contrôlez.
The spell checks on resolution to see if any mana of the stated color was spent to pay its cost. It doesn’t matter how much mana of that color was spent.
If the spell is copied (such as with Twincast), the copy will never have had mana of the stated color paid for it, no matter what colors were spent on the original spell.