Aang, the Avatar

Energybending (Whenever you cast a noncolorless
spell, this creature gets +1/+1 until end of turn.)
Lands you control tap for any mana thats in
Aang, the Avatar's mana cost.
Whenever you cast a spell that shares color with
Aang, the Avatar, reduce the mana cost for all
other spells with a different color by {1} until
end of turn.