Just something I noticed

[Coffee Vampire]

{Wrack into Madness} would be hilarious against {Phyrexian Obliterator}.

yeah that's it lol

[Ghetto Pass]

Wow, that's just mean.  And hilarious.

[AgrusKos]

Of only oblit would survive

[Thorn]

My sideboard suddenly changed.

[Imdowd80]

Umm you control {wrack into madness} and that is what is causing the damage do you should have to sac. 5 permenants not the owner of OB. At least the way I look at it, but I'm not a rules expert.

[tsul25]

You control {Wrack with Madness}, but the way I'm understanding it is that the source of damage would be the obliterator dealing the damage to itself, and the controller of that source is your opponent. But I'm not an expert either lol

[Coffee Vampire]

{Wrack into Madness} does not say:

wrack into madness deals dmage to target creature equal to its power.

...it says the creature itself deals damage to itself. So whoever controls the obliterator will sac 5 permanents in adition to losing his or her oblit.

[Silent1236]

{Wrack wit Madness} causes the obliterator to deal damage to itself, effectively killing it with no saccing.  It's a red {Go for the Throat} for CMC essentially

[InfinitiveDivinity]

{Wrack wit Madness} causes the obliterator to deal damage to itself, effectively killing it with no saccing.  It's a red {Go for the Throat} for CMC essentially

It's still a source of damage even though it's itself, it essentially board wipes your opponent

[BlackJester]

{Bareen Glory} for black-border landers. 😜