Crona, the Fallen

Madness Wavelength — When this creature
transforms into Crona, the Fallen, goad all
creatures your opponents control.
Maddened — Haste, Crona, the Fallen cannot
attack it's owner, it must attack each combat if
able, and cannot be sacrificed.
At the beginning of each player's upkeep, that
player untaps Crona, the Fallen, and gains
control of it.