Icebound Guardian

Cumulative upkeep {1}{w}{w} (At the beginning of
your upkeep, put an age counter on this permanent,
then sacrifice it unless you pay its upkeep cost for each
age counter on it.)
When Icebound Guardian enters the battlefield,
choose a color.
You have resistance from the chosen color. (You
can't be dealt damage by anything of the chosen
color.)