I was just poking around for ideas when I stumbled on Touch of the Eternal, then thought of Endless Horizons.  By pushing up the number of permanents, I increase the need to deal more and more damage to kill me each turn. A good number of the creatures (about half) are indestructible, so they are likely to last as well. I filled in the low end with more general-purpose creatures to buy time. If I could get to my ideal—Platinum Emperion with Darksteel Plate and Whispersilk Cloak equipped. That would difficult to undo, so it would just be a matter of wearing the opposition down. It needs to be able to last, so the 17/8/11/2/0/0/1/1 curve gives a nice 2.23 average for a deck with so much so far up the curve.