Creature - Treefolk Shaman {T}: Up to two target Swamps each become 3/5 Treefolk Warrior creatures in addition to their other types until end of turn.1
You can choose to target zero swamps and do nothing except tap this card. [Morningtide FAQ 2008/01/15]
Remember that when this becomes a creature, it is subject to "summoning sickness" and cannot attack unless you controlled it since the start of the turn. [Morningtide FAQ 2008/01/15]