Form of the Mulldrifter

When Form of the Mulldrifter enters the battlefield, draw two cards.
You may cast creature cards from your hand as though they were the card Mulldrifter. (You can still evoke this way. They’re Mulldrifters.)

Command the Chaff

Look at target opponent’s sideboard. You may cast a card from that sideboard without paying its mana cost.
Exile Command the Chaff.