Clement, the Worrywort (Borderless) (Raised Foil) [Bloomburrow] Human Ranger Spells you cast have booster

Spells you cast have booster cascade

Set: Commander Legends Type: Legendary Creature — Human Cleric Rarity: Mythic Cost: {1}{W}{B} Lifelink

Reverse Type: Legendary Planeswalker — Ajani [+2] Put a +1/+1 counter on each Cat you control

Shatterskull Pass is a pretty distant second

" —Father

Clement, the Worrywort (Borderless) (Raised Foil) [Bloomburrow] Human Ranger Spells you cast have boosterSet: Bloomburrow Type: Legendary Creature Frog Druid Rarity: Rare Cost: {1}{G}{U} 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 "{T}: Add {G} or {U}. Spend this mana only to cast a creature spell."