Infinity ULTRON

If you would loose unspent mana, that mana becomes black mana instead.

At the beginning of your precombat 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 it’s mana cost. If you do, add three mana in any combination of it’s colors and put it into your hand. If you don’t reveal it, put it into your hand.