Cavern of Souls [Modern Masters 2017] Unhinged Fusion Monsters that list "Elemental

Fusion Monsters that list "Elemental Hero Neos" as a Fusion Material Monster do not have to have their effects activated that return them to the Fusion Deck during the End Phase

A grave is the safest place to store ill-gotten treasures

Set: Platinum: Arceus Type: Fire Rarity: Promo Retreat cost: Colorless

your opponent cannot activate cards or effects until the end of the Damage Step

Whereas Mishra works in metals and stone

Cavern of Souls [Modern Masters 2017] Unhinged Fusion Monsters that list "ElementalSet: Modern Masters 2017 Type: Land Rarity: Mythic As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.