Build a board of both Elves and Wolves Elves scale the +1/+1 counter pump, Wolves fuel your card draw
As for Wizards and Cats, which bring up the middle, Wizards has the single best commander in the entirety of Commander 2017 in Kess, Dissident Mage
Removal: Feed the Swarm, Infernal Grasp, Bojuka Bog, a cheap wrath like Mutilate
Generally I shy away from effects like this, especially with +1/+1 counters just not being very good if that's the focus of your deck
With the release so close, players are preparing for the new characters and cards that will bring fresh gameplay
Realmwalker can be any creature type you want it to be, and itll make it easier for you to fill up your board with creatures