Ainz Ooal Gown, Overlord

If you would lose unspent mana, that mana
becomes black instead.
At the beginning of your pre-combat main
phase, look at the top card of your library.
You may reveal that card if it has three or
more colored mana symbols in its mana
cost. If you do, add three mana in any
combination of its colors and put it
into your hand. If you don't reveal it,
put it into your hand.