Kheru Spellsnatcher is a rare Creature — Snake Wizard card from Duskmourn: House of Horror Commander (DSC), collector number 119. Current market price: $0.25, TCGplayer market prices via Scryfall.
Morph {4}{U}{U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.) When this creature is turned face up, counter target spell. If that spell is countered this way, exile it instead of putting it into its owner's graveyard. You may cast that card without paying its mana cost for as long as it remains exiled.