Icatian Doctor

Comes into play with one credit counter on it.
{t}: Add 1 credit counter to it.
{t}, remove one credit counter from it: Choose
one —
•Deal 1 damage to any target.
•Prevent 1 damage to any target.
•Put 1 credit counter on any target.
I'm a doctor, Jim, not a javelineer moneylender!