Originally Posted by
Rock Lee
Absolutely better than a sweeper. Often used moment's peace as an effective 2/3 mana 5+ life gain on goyfs, or as a response to annihilate 6 board reset on emrakul. The games I used it on its effective health gain would have allowed me additional copies of glacial chasm, something sweepers don't, as they usually hit at the cmc where you're too low health to efficiently multi-copy.
I had someone counter the first copy, then I flashed it back and was free to untap and cast titan. I removed it several times on my turn to cast it in response to a DRS, which didn't prevent on my turn but did prevent the 2 life loss. Of course the biggest aspect is giving another chasm-effect against elves, which I didn't play against all day, but did come up against effectively in the top 8 with Eli Kassis and his Natural Order Bug -> Craterhoof list.
TLDR: Odd interplay, but it did work well. The 2/3 CmC slot is perfect when you're just trying to stall, you already have great things to do at higher cmc.
Regardng Karn, I cast him 3 times just during this event off of 5 mountains and 2 basics and activated him multiple times, two things Ulamog couldn't do. One of those 3 times the person just scooped as they realized they were locked out of the game because of karn's one-sided liliana effects. The other time they scooped to me exiling a Painter and Grindstone, which meant I could restart the game and kill them on turn 1. I also side in karn vs most forms of combo to deal with their sideboard answers and to remove their ability to achieve critical mass while I am able to side out high cmc win cons on my part for 2-4 cmc wincons.