EmrOkol, The Promised Elk

Flying, Trample, Protection from Instants
and Elks
At the beginning of your upkeep, create a food
token, then you may exchange control of target artifact or creature you control and target creature
an opponent controls with power 3 or less.
Whenever EmrOkol, The Promised Elk attacks,
up to three target artifact or creatures lose all abilities and become green Elk creatures with
base power and toughness 3/3.