Meh. lol not too bad. I like the first one. you have done the impossible. YOU HAVE MADE A REASON TO CARRY REGEN MUMMY!!!!
most pointless card effect in dueling i swear...
That being said...
Shadow mummy: good to go
Comander's mummy: 1 Zombie-type tuner monster + 1 "Regenerating Mummy"
When this card is Synchro Summoned succesfully, you may Special Summon Zombie-type monsters from either player's graveyard whose total levels are equal to 4 or lower to your side of the field. If this card declares an attack, it is changed to defense position during the End Phase.
A few changes to the wording were needed. Also, I dont like fiends trespassing on my zombie cards lol. And a level 4 zombie tuner is non-exsistant at the moment :'( so it would be impossible to get this guy out if you were tried-and-true zombie (or if you had zombie world out). If you really want him to require Regen Mummy and another level 4 zombie/fiend, make him a fusion instead of a synchro.
Mummy Priest: Wording is a bit off, but an okay effect.
Pharoh's Mummy: WOOOOOOOOOOOOH no... WAY to OP. There is NO way. for a zombie swarm deck, it will be VERY easy to Special Summon this guy. The fact that he has 3000 ATK is ENOUGH. Then, if you have zombie world, this guy can EASILY get up to 10,000 ATK... so you cant get away with that kind of increase. The discarding 2 cards to attack directly? eh.... may be okay if he switches to DEF afterward. And get rid of the "isnt affected by effects of other cards". that is just too strong. either make it spells, traps, or monsters. Or even "targeting". but not invincable to EVERYTHING.
Anyway, I like the concept. Zombies are my favorite. but needs a bit of work. 3/10