Mugmug, Perverter of Worlds

Haste, menace
When Mugmug, Perverter of Worlds enters
the battlefield, create Mugmug's Mug, a
legendary artifact token with "{t}, Target dwarf
gains indestructible until end of turn."
If Mugmug's Mug would ever leave the battlefield, Mugmug, Perverter of Worlds loses
all keywords and abilities.