The one mark in this cards favor is its resilience
Whenever this creature attacks, you win the game if there are twenty or more counters on it or you have twenty or more cards in hand
Halana and Alena are a huge target and likely wont stick around for long on the battlefield, but if youre able to untap with them and play another creature after them, that creature gets an upgrade
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Azurite Sea - Amber and Ruby Best cards: Wendy, Courageous Captain
Sacrificing things to Greyfax is just one option, you could throw them to Commissar Serverina Raine instead for life and cards, or to The Golden Throne for mana