Ben, the Handsomest Boy

When Ben, the Handsomest Boy enters the battlefield, target opponent chooses a color. Ben
has protection from all but the chosen colors.
Whenever a player casts a spell that is the chosen color, put a +1/+1 counter on Ben and gain 2 life.
Ben- 27 years old, single, enjoys long walks through
the wilderness in the middle of God-forsaken nowhere