Magus of the Dictate

Whenever you tap a source for mana, add
1/2 of any type of mana that source could produce. (Two 1/2 manas create one
whole mana. If the 1/2 manas are different colors, you may choose which color the whole
mana is.)
"Splitting mana is like splitting atoms. You're playing with fire here."
- J. Robert Oppenheimer