Hex Parasite

Oracle Text

X(B/P): Remove up to X counters from target permanent. For each counter removed this way, Hex Parasite gets +1/+0 until end of turn. ((B/P) can be paid with either B or 2 life.)

Card Rulings

6/1/2011 You may choose a value for X that’s greater than the number of counters on the targeted permanent. However, Hex Parasite only gets the bonus for counters actually removed.
6/1/2011 If the permanent has multiple kinds of counters, you choose how many of each to remove when the ability resolves.