Frank Zhang, Demigod

{r/g}: Choose one - Until end of turn, Frank Zhang,
Demigod becomes a 6/6 Bear and gains trample,
or until end of turn, Frank Zhang, Demigod
becomes a 4/4 Dragon and gains flying, or
until end of turn, Frank Zhang, Demigod
becomes a 2/2 Dolphin and gains islandwalk.
Activate this ability only once each turn.