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If you're looking to make Anowon even stronger through upgrades, I would suggest adding more powerful Rogues like Thada Adel, Acquisitor, more ways to generate value through combat like Knowledge Exploitation, and finally more ways to plunder our opponents' graveyards like Mnemonic Betrayal

That's not all

Creatures with the Persist ability come back from the graveyard after they are destroyed if they have no counters on them, and then receive a -1/-1 counter upon their return

Drawing and bouncing for three mana at instant speed is a very good rate

On paper this looks great even in a singleton format as tokens are common place and Cloning can be a thing

(2017-08-25) If you don't put the top card of your library into your hand, you put it back on top of your library without revealing it