Kuldotha Forgemaster [Double Masters] XY43 You may cast a spell

You may cast a spell from among those cards without paying its mana cost

Set: Mirrodin Besieged Type: Creature — Sphinx Rarity: Mythic Cost: {4}{U}{U} Flying

Set: Commander 2017 Type: Creature — Cat Warrior Rarity: Rare Cost: {4}{G} Reach

return it to its owner's hand at the beginning of the next end step

Set: HeartGold & SoulSilver: Triumphant Type: Psychic Rarity: Ultra Rare Retreat cost: 0

Kuldotha Forgemaster [Double Masters] XY43 You may cast a spellSet: Double Masters Type: Artifact Creature Construct Rarity: Rare Cost: {5} {T}, Sacrifice three artifacts: Search your library for an artifact card, put it onto the battlefield, then shuffle. The goblins say it used to be larger, before it began to stoke the Great Furnace with pieces of itself.