Maiden of the Wheat

Maiden of the Wheat enters the battlefield with
a purity counter on it.
Whenever Maiden of the Wheat attacks or blocks, remove all purity counters from it.
At the beginning of your end step, if Maiden of
the Wheat has a purity counter on it, you gain 1 life. Otherwise, bolster 1. (Choose a creature with the least toughness among creatures you
control and put a +1/+1 counter on it.)