Though having more dredgers is always good, the only problem is cutting another card on your main board which is already a tight list to begin with. Entomb isn't necessary IMHO. I'd rather squeeze another dredger than use entomb. TBH having 12 dredgers is more than enough to avoid mulliganing to oblivion. Most of the successful lists already have around 11-12 dredgers anyways so I think squeezing the 13th is too much.

