Metamorphosis [Arabian Nights]Set: Arabian Nights Type: Sorcery Rarity: Common Cost: {G} As an additional cost to cast this spell, sacrifice a creature. Add X mana of any one color, where X is 1 plus the sacrificed creature's mana value. Spend this mana only to cast creature spells.

dragons you control have go again while attacking

where X is its power

Set: HeartGold & SoulSilver: Undaunted Type: Metal Rarity: Holo Rare Retreat cost: Colorless

Set: Alpha Edition Type: Creature — Human Druid Rarity: Rare Cost: {1}{G}{G} Whenever you cast an enchantment spell

Set: HeartGold & SoulSilver: Call of Legends Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

return target creature to its owner's hand

these devices doubled the output of Amrit Vatyam's forges

Set: Beta Edition Type: Sorcery Rarity: Common Cost: {B} Return target creature card from your graveyard to your hand

Set: Classic Sixth Edition Type: Instant Rarity: Uncommon Cost: {G} Search your library for a creature card

its controller adds an additional {R}

Set: Sun & Moon: Lost Thunder Type: Grass Rarity: Holo Rare Retreat cost: Colorless

Remove a +1/+1 counter from Triskelion: It deals 1 damage to any target