Creature - Shapeshifter 3/4, 3UU (5) As long as an opponent controls a creature with flying not named Escaped Shapeshifter, Escaped Shapeshifter has flying. The same is true for first strike, trample, and protection from any color.1
Illus. Douglas Shuler
This card ignores any other Escaped Shapeshifters in play when checking to see if another creature has the various abilities. [WotC Rules Team 1997/12/18] [Duelist Magazine #22, Page 27]
Effects, such as the Radjan Spirit's, can remove an ability from the Shapeshifter as if it had that ability naturally. [WotC Rules Team 1997/12/18]
All abilities listed on the card (Flying, First Strike, Trample, and Protection from Color) are considered to be initial abilities of this card which are only "on" under certain conditions. When determining order of effects, these abilities are considered to be built-in and thus are the oldest. [Duelist Magazine #23, Page 22]
In a multiplayer game, it works if any opponent controls creatures with the appropriate abilities. [bethmo 1998/03/24]