Wildshape\'s gambit

Your Chaosboard can contain only creature cards. Commanders you control have “Whenever you cast your first creature spell each turn, roll a d20. As that spell resolves, put it into your Chaosboard face down, then shuffle your Chaosboard. 1–9 — Your Commander Explores. 10–19 — Primal Shift – Exile cards from the top of your library until you exile a creature card. Put that card into your Chaosboard face down, then shuffle your Chaosboard. Put the other exiled cards on the bottom of your library in a random order. You may cast the top card of your Chaosboard this turn. You may spend mana as though it were mana of any color to cast it. 20 — Look at the top three cards of your Chaosboard and put them back in any order. You may cast the top card of your Chaosboard this turn without paying its mana cost. Place a shield counter on it then it gains haste and trample until the end of turn. Then Primal Shift.”