Raizyn, the Storm Rider

Companion — Your starting deck may have an Instant or Sorcery card on the top. (If this card
is your chosen companion, you may cast it once from outside the game.)
Flashback {u/r}{u/r}
Once per turn, you may cast an Instant or
Sorcery card from your deck for its
converted mana cost and pay any extra mana
that it requires.