Vorel of the Hull Clade

• WWizards of the Coast2013-04-15
  Official Ruling
  The effect of Vorel's ability will essentially double the counters on the target artifact, creature, or land. For example, if a creature has three +1/+1 counters and a divinity counter on it before the ability resolves, it will have six +1/+1 counters and two divinity counters on it after the ability resolves.

Rulings via Scryfall