source:
http://www.wizards.com/magic/magazine/article.aspx?x=mtg/daily/stf/22name: silly dude
cost: wwuubbrrgg
10/10
protection from everything
dsc's graveyard clause
I think this effectively replaces Oath's sideboard creature of Simic Sky Swallower or whatever the new hotness is.
It effectively has shroud, can easily be discarded to TfK(sadly with another card), and is unblockable.
It is legendary though so only one, but barring a wrath of god or other non-damage sweeper it is staying in play. I wouldn't replace the main creatures of hellkite/akroma, but it will def have a place in my sideboard.
This seems pretty obvious to me, but is there any reason why this wouldn't be a better choice that I am overlooking?