Cast Doomsday by paying ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) , searching your library and graveyard for Gush, Gitaxian Probe, Lion's Eye Diamond, Yawgmoth's Will and Laboratory Maniac, then exiling the rest of your library and graveyard, putting the aforementioned cards on top of your library in that order, and causing you to lose half your life total, rounded up.
Draw Gush from the top of your library.
Cast Gush by returning two Islands you control from the battlefield to your hand, causing you to draw Gitaxian Probe and Lion's Eye Diamond.
Cast Lion's Eye Diamond by paying ({0} magic symbol) .
Cast Gitaxian Probe by paying ({UP} magic symbol) .
Holding priority, activate Lion's Eye Diamond by sacrificing it and discarding your hand, adding ({B} magic symbol) ({B} magic symbol) ({B} magic symbol) .
Resolve Gitaxian Probe, causing you to look at a player's hand and draw Yawgmoth's Will.
Cast Yawgmoth's Will by paying ({2} magic symbol) ({B} magic symbol) , allowing you to cast spells from your graveyard this turn.
Cast Lion's Eye Diamond from your graveyard by paying ({0} magic symbol) .
Activate Lion's Eye Diamond by sacrificing it and discarding your hand, adding ({U} magic symbol) ({U} magic symbol) ({U} magic symbol) .
Lion's Eye Diamond is exiled instead of being put into your graveyard due to Yawgmoth's Will.
Cast Gitaxian Probe from your graveyard by paying ({UP} magic symbol) , causing you to look at a player's hand and draw Laboratory Maniac.
Gitaxian Probe is exiled instead of being put into your graveyard due to Yawgmoth's Will.
Cast Gush from your graveyard by returning two Islands you control from the battlefield to your hand, causing you to draw two cards and win the game due to drawing from an empty library.