Clement, the Worrywort (BLB-347) – Bloomburrow: (Showcase) (Borderless) Foil [Rare]

Vigilance
Whenever Clement, the Worrywort or another creature you control enters, return up to one target creature you control with lesser mana value to its owner’s hand.
Frogs you control have “: Add or . Spend this mana only to cast a creature spell.”