Aetherial Energy Shaper

As this enters the battlefield, choose a Mode.
• Mode 1 —Whenever counters would be put
on a permanent or player except +1/+1 counters,
that many minus one are put on it instead.
• Mode 2 —Whenever counters would be
removed from a nonplaneswalker permanent,
that many minus one are removed instead.
{4}: Change Mode. Activate this ability only once
per turn. by PBRunny