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If you really like the ATK reduction + destruction effect of Slifer the Sky Dragon , King Tiger Wanghu gives you virtually the same effect, and is easier to set up

A 3 mana investment to give a creature Flying and Ward 4

My opinion did slightly change on Cecil, Dark Knight because I dont have a Deaths Shadow archetype in my cube (which is hard to do in singleton) but someone did draft a pretty sweet deck that technically went undefeated in the swiss rounds (going 3-0) but lost to me, (who sat out since we had an odd number of drafters - I ended up going 2-0 from playing that player and someone else.) This was the deck: Ive also posted it on Moxfield

The most popular options tends to be mono-white Giada which solves some issues, sure or Kaalia, which is often not purely an Angel typal deck

Diamond Total Carat:0.04

But that doesnt look to be the case