Text (10): 5/4, Trample. ; At the beginning of your upkeep, return a green creature you control to its owner's hand.
The upkeep effect is not targeted. So it can affect a creature with Protection from Green, for example. [Duelist Magazine #18, Page 29]
You choose a creature and return it all during the resolution. This means that if you have two Wildebeests, there is no way to end up returning only one creature. [D'Angelo 1999/07/10]
Note - This card was of creature type "Wildebeest" until Oracle 2006/01/15, when it became "Beast". Then with Oracle 2007/10/01 it became "Antelope Beast."