His card stretches the definition of the "Mystic Arcanum" ability, which usually refers to a warlock spell of 6th level or higher
Your creatures are protected from counterspells, and having flash makes the mana value manageable
You can find them in Set, Draft, and Collector Boosters, in both foil and non-foil
Playing Wrenn and Six on Turn 2, makes you feel so ahead and there arent many interactions to it (except for exactly Pierce or Snare) if youre OTP
Primordial is a bit better since it exiles any creature rather than just destroying the largest creature, but both are useful when everybodys racing to see who sticks the strongest battlecruiser
Goldspan Dragon is an accelerant for decks that use Treasure, while Tibalt's Trickery is a rare counterspell in red