Entomb+creature+Zombify= big creature very early of any color in any deck no matter what the casting cast. Bad news when they get out an irridescent Angel on 3rd turn
I dunno, I never liked that combo. Paying 3BG for a 6/6 just seemed kinda weak when it doesn't come with Regeneration, +1/+1 counters, and the ability to change colors...
I think entomb is much, much better in extended with all of the other solid recursion spells that exist.
Shard Phoenix
Squee
Hammer of Bogardan
Krovikan Horror
Corpse Dance
In type 2 I'd prefer to Entomb an Iridescent/Crosis into my graveyard on turn 1 and Death it out turn 2 for 7/6 life. But that doesn't mean I wouldn't run Roar of the Wurm also.