Text (PC+errata): Until end of turn, target creature you control gains trample and gets +X/+0, where X is its power. Sacrifice it at the beginning of the next end step. [Oracle 2009/07/08]
If you don't control the affected creature at end of turn, it is not sacrificed. [Planar Chaos FAQ 2006/12/13] This is because you can only sacrifice things you control. [D'Angelo 2007/01/30]
