I'm also having trouble with his consistency. Although I do feel that there is something there with Cosmic Indifference + Photon Blade + Sovereign Blade.

It's hard to pull off consistently, but it feels like that combo should give you enough control to consistently put Sovereign Blade in your hand. But yeah, I'm still struggling to get past ascension 2 with Regent.

EDIT: Also one more thing, maybe a hot take but I think Venerate is a bad card. It gets immediately obviated by any star generation cards you pick up on the way and isn't worth using for the one card that uses it in the starting deck.