Merfolk Thaumaturgist

{T}: Switch target creature's power and toughness until end of turn.

Mannichi, the Fevered Dream

{1}{R}: Switch each creature's power and toughness until end of turn.

Dwarven Thaumaturgist

Trait Doctoring

Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another until end of turn.
Cipher (Then you may exile this spell card encoded on a creature you control. Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.)

Blind Seer

{1}{U}: Target spell or permanent becomes the color of your choice until end of turn.