Necra Santuary / Sterling Grove is definitely buildable. I've been mulling over an IBC Necra deck but I haven't had the patience yet (or money) to actually get a final decklist.
Hope you don't mind me posting it.
Creatures
2 Desolation Angel
3 Necravolver
Enchantments (make those Grove's worth playing)
4 Necra Stanktuary
4 Sterling Grove
3 Deuling Grounds (combo w/ D. Angel, good defense)
3 Phyrexian Arena
2 Overgrown Estate (combo w/ D. Angel)
1 Pernicious Deed (just in case)
Spells
4 Rout
3 Eladamri's Call
4 Vinny D. Cate
3 ??? Death Grasp or Harrow maybe
Lands
Lots of Painlands, damn
More casual and/or creature heavy stuff to consider:
Celestial Convergence
Argothian/Feremet Enchantress (the deck could be enchantment heavy)
Serra's Sanctum
Charging Troll
Ranger En-Vec
Sabertooth Nishoba
Fleetfoot Panther (surprise, take 3 damage)
Hope this helps to get you going.
Mike
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Raka + Galina's Knight (nice) + Teferi's Moat = Your opponent better hope they aren't playing a creature deck.