Themberchaud Secrets of Strixhaven Mystical Archive each opponent can't block with

each opponent can't block with more than one creature this combat

You may spend mana as though it were mana of any color

Exile all creature cards from target player's graveyard

they mill that many cards plus four instead

choose one — • You may put a Bird creature card from your hand or graveyard onto the battlefield with a finality counter on it

Themberchaud Secrets of Strixhaven Mystical Archive each opponent can't block withTrample When Themberchaud enters, he deals X damage to each other creature without flying and each player, where X is the number of Mountains you control. You may exert Themberchaud as he attacks. When you do, he gains flying until end of turn. (An exerted creature won't untap during your next untap step.)