Death Zone Ox

When Death Zone Ox enters play, if {s} was used
to play it, all Snow creature you control gain
+1/+1 and Lifelink until the end of the turn.
The bodies of their kind were far huge for even the
trees of this land to serve as grass. So the kind ones
trudged up the highest mountains to add their bones
to the slopes. Their spirits are too large to just lay
down and die, but not unkind to those who know
how to honor them.