Noticing Omarthis, Ghostfire Initiate is missing from the list. With all the counters being placed on things, he’ll become absolutely massive very quickly, and will explode into a bunch of manifests when he dies, which can be used to dig for most creatures, or just swing for a lot. Just be careful that you don’t deck out… or run a copy of Lab Man and flip him before you would lose. Not sure if I’m sold on Flood of Mars since your creatures will lose their abilities if they become copies of it, and you can’t target your opponent’s stuff or else they’ll just convert Danny.
I'd say it's a great choice if you include more colorless creatures to take advantage of its ability. Having only about 5 in this build, it's not really the focus, and since it doesn't put counters on itself except when it's cast. But there's definitely a great version of this deck that focuses more on colorless creatures getting counters, and I wish this card did work better with this build!
Be careful with Chasm Skulker & Wizard Class levelup. If you have no other valid target you'll be forced to draw infinite cards & deck out, they aren't "may" abilities!