Engineered Explosives [Kaladesh Inventions] RC12 You can only use this

You can only use this effect of "Harpie Dancer" once per turn

"Frog" monsters

change it to Attack Position at the end of the Damage Step if it has no Xyz Materials

Set: EX: Dragon Frontiers Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

Engineered Explosives [Kaladesh Inventions] RC12 You can only use thisSet: Kaladesh Inventions Type: Artifact Rarity: Mythic Cost: {X} Sunburst (This enters the battlefield with a charge counter on it for each color of mana spent to cast it.) {2}, Sacrifice Engineered Explosives: Destroy each nonland permanent with mana value equal to the number of charge counters on Engineered Explosives.