His second ability appears to synergize somewhat with the face commander of the "Scions & Spellcraft" precon, Y'shtola, Night's BlessedY'shtola, Night's Blessed, but only just
How many of them are you running
Rebuilding around the top end chase cards gets expensive in a hurry, but the good news is that the format is stacked with cheap, proven role players
And when you play an item card, you get to draw a card
You could have and lose Threshold on creatures and spells in the middle of actions and phases, making it difficult to track when it was active throughout the course of a game
Ending up as Spider/Legendary Typal in Naya is whatever, I'm sure this is going to hit its mark in terms of popularity