Every player begins the game with a Maskwood Nexus Emblem that starts in the command zone and states:

"Creatures you control are every creature type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield."

A homebrew ruling for this cube is that whenever a card states that another card "loses all abilities" that includes the effects of the Maskwood Nexus Emblem, making it lose all creature types except the types on the printed card.

Another homebrew ruling is that mutate can target your creatures, ignoring the non-human text of the ability.