mtg arabella commander deck Arabella, Abandoned Doll Arabella, Abandoned Doll Toy Commander

Assuming you can afford to pay eight mana and unlock both Rooms right off the hop, every enchantment cast produces +1/+1 counters equal to its mana cost, and every permanent you cast immediately becomes an enchantment

In any case, you want to be combining enablers like Teferi's Puzzle BoxTeferi's Puzzle Box, Howling MineHowling Mine, and the original Wheel of FortuneWheel of Fortune with payoffs and damage dealers like Fate UnravelerFate Unraveler, Sheoldred, the ApocalypseSheoldred, the Apocalypse, and Razorkin NeedleheadRazorkin Needlehead

Equipping ViviVivi will also buff him up, and if the amount of power gained is greater than the equip cost, it's mana positive

Its a 6/6 trampler for six, but its mutate cost is only 1BGU