Matoya, Archon Elder is a sweet draw engine, and I can see her fitting into Kenessos sea creatures, Tales of Middle-earth blue-green decks like Elrond and Galadriel, and shell also just generally be a good engine piece in graveyard strategies that surveil a lot, like Mirko, Obsessive Theorist
We really wanted to use a Phyrexian mana in her cost, as Phyrexian mana is closely associated with the Phyrexians, but we only wanted to have one Phyrexian mana, and the character was two-color, so for the first time, we introduced Phyrexian hybrid mana
The only thing holding Jin-Gitaxias, Progress Tyrant back from being uncompromisingly brutal is that seven-mana casting cost
Good man Christian Calcano snagged a GP win with this Snapcaster Mage beatdown deck: Creatures (12) Lands (23) Spells (25) Vapor Snag deserves a nod, though its not cracking the Top 50 list of blue cards