Yawgmoth, Corrupted

Anytime you add mana to your mana pool, that
mana becomes the phyrexian version of that
color of mana (the same counts for colorless)
When Yawgmoth dies, Choose one at random
•You gain 20 life
•Create an 8/8 black Horror creature token
•Target opponent loses 10 life
{bull}You lose the game