
Whenever this creature attacks, each other creature you control gets +X/+X until end of turn, where X is this creature's power.
"When they covered the world in city, all they did was give themselves nowhere to run."
Illustrated by Kev Walker · Return to Ravnica · #139
2017-07-14
If this creature's power is negative as its ability resolves, X is considered to be 0.
2012-10-01
The value of X is determined when the triggered ability resolves. If Wild Beastmaster is no longer on the battlefield at that time, use its last known power to determine the value of X.