Fol, World's Breath

Fol, World's Breath enters the battlefield with X world counters on it. Then, as it enters the battlefield, choose X card types. Those card types cost X more for opponents to cast.
Fol, World's Breath's power and toughness are each equal to 2 + the number of world counters on Fol, World's Breath.
{t}: Add X mana in any combination of colors to your mana pool.