I uh... What booster were you replying to? Because the four on this page don't have Bitterblossom in them >_<Bitterblossom. Just because it wins every game you drop it T2, i don't want to play against it
After that pretty clearly jace for me.
I'll give this a try.
I was looking at that Entomb and thinking... What is wrong with this picture?Probably Goyf or Deathrite, I'm not sure which is the more necessary card in your enviornment.
Also nice M15 Entomb
Attrition seems like a bonkers card in a reject rare cube. Repeatable removal on a near unkillable permanent type (considering enchantment removal is pretty rare at rare).