Regan, King's Alchemist

{w}{g}: change the text of target spell, ability or creature by replacing all instances of the word artifact or enchantment with the other
until end of turn.
{u}{r}: change the text of target spell, ability, or creature by replacing all instances of the word instant or sorcery with the other until end of turn.
{c}{b}: change the text or target spell, ability, or creature by replacing all instances of the word creature or planeswalker with the other
until end of turn.