Modular Monstrosity (UST) from Unstable, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Alex Konstad
• Card Text:
  Whenever an opponent casts a spell, you have five seconds to choose a keyword you haven't chosen for a card named Modular Monstrosity today that's been printed on a creature card. If you do, Modular Monstrosity gains that ability. Otherwise, Modular Monstrosity loses all keyword abilities.