5 cards steal EVERYTHING

Choose a creature type. If you control more creatures of that type than each other player, you gain control of all creatures of that type. (This effect lasts indefinitely.)

Choose a creature type other than Wall. Each creature becomes that type until end of turn.

All permanents are artifacts in addition to their other types. All cards that aren't on the battlefield, spells, and permanents are colorless. Players may spend mana as though it were mana of any color.

All Forests are 1/1 creatures that are still lands.