I have one suggestion for Merem that could work:
1, Tap: Reveal the top card of your library. If the card revealed is one of Merem's Limbs, put it in your hand. Otherwise, the card is sent to the graveyard.
As to your Atlas art, that's the Temple (I forget the proper name for it, I remember it being Temple or something like that), that large building where Warakia shows up, not Atlas. Atlas is way out in Egypt, IIRC.
Arc Drive is kind of odd to be a white card, of all things. White is usually indicative of healing and enchantment, and Arc Drives seem more like they're offensive-based than defensive as well, so adding the toughness modifier doesn't make sense. I would say it should be a red card, but it could also bestow an extra ability, like Double Strike.
I'm surprised I haven't seen Eyes of Death Perception yet.
I'd imagine it would be something like this:
Mystic Eyes of Death Perception (2)(B)(B)(B)
Enchantment
Flash, Shroud
Creature gains the ability, "Whenever a creature is damaged by this creature, remove that creature from the game." (Deathtouch won't work, since it only destroys creatures - MEoDP removes the target from existence).
I realize it could be improved, of course.
Also, WHAR IS LEN. WHAR ARE THE LOLIS IN THIS MAGIC EXPANSION. I demand that there by a creature type of Loli.