Self-mill effects can help you fill your graveyard with big threats, after which you just need to mutate Nethroi to get easy access to lots of options
Youll have a hasty 6/6 trampler as a commander, and thats like 10% of the card
That is, you can't just put your hand over it and claim that can't see it
Or you might draw on the WBG combos that let ramp your way into a few huge creatures, like Looming Altisaur, or Indomitable Ancients. Or you can mingle those strategies: perhaps you summon a Watchful Radstag early game, which both grows bigger and spits out token copies as you pop out mid-range creatures, then pimp out those tokens with a Canopy Gargantuan and keep Scour the Desert in hand to flood the board with a token army if all else fails
(You are allowed to do this at a Prerelease
In practice, I just wasnt able to get a big enough bunch of barking buddies bouncing around on offense