What would you do with 100 mana?

[rarehuntertay]

 {Exsanguinate} for 98... All opponents should die

[Coffee Vampire]

Proceed to my second main and watch it all go away!

[MisterJH]

Id pay WotC 80 mana to bring back mana burn then end that turn muhfuh

[AdamS]

cast 30-32 {relentless rats} use last 3-12 to cast something to give them all haste and swing with all of them

[ibtrickey]

Cast  {Trait Doctoring} fifty times for the heck of it then split second kill your opponent for the rest!
I have no idea. Why would you need 100 mana? Not enough for {Gleemax}

[Splicer]

{Ominesceince} and {Enter the Infinite}, plus {Hammer of Purphous}. Swing for game with my deck

[Rass]

Run it thru  {Initiates of the Ebon Hand} and see what will happen.

[VQMracing]

Use 101 and put into a monstrous {hydra broodmaster} and have 50 50/50 hydras running around destroying people! Muhhahahaha

[FlickerYourOwnIdentity]

{Mox Lotus}; {Gleemax}; {Darksteel Forge}; win

[FustyDavorite]

I'd pump my bff  {Dragon Hatchling} for days.

Man I'm having fun with this 100 mana game

[FustyDavorite]

Tap out for {Chalice of the Void}. Those 50 CMC spells are real pesky

[FustyDavorite]

 {Force of Will} and exile  {Jace, the Mind Sculptor} from my hand, pay 1 life. I play so much legacy I forgot this card had a mana cost