Derp Yagami

When Derp Yagami enters the battlefield,
target legendary creature loses all abilities, has
base power and toughness 1/1, and is a Human
Frog instead of its other types for as long as
Derp Yagami is on the battlefield.
{u}{u}{u}{u}: Derp Yagami becomes a copy of
target Human Frog.
"I am the GOD of the new... RIBBBITT"
-- Light Yagami?... [undetermined]