Lutri, the Spellchaser was controversially (and correctly, in my opinion) banned from Commander on release as itd otherwise be an auto-include in any deck playing blue and red (almost any Commander deck fulfills the companion restriction, as this was clearly not designed for Commander)
They are no longer usable in the current Standard format
Show up and pay the $5-10 to enter and wait for the matches to be set up
Mono-black cards like South Wind Avatar can support these strategies, but its most often used in sacrifice strategies with Blood Artist or Zulaport Cutthroat, or with commanders like Vito, Thorn of the Dusk Rose
Exile Phoenix, then return it to the battlefield (front face up)
An even better spell if you consider decks with damage doubling effects