2010-08-15 : You check the power of your creatures as Overwhelming Stampede resolves. For example, if you control a 2/1 creature, a 2/2 creature, a 2/4 creature, a 4/1 creature, a 5/5 creature, and a 5/6 creature at that time, each of your creatures gets +5/+5 and gains trample until end of turn.