Shanzar, Master Necromancer

Planeswalker - Shanzar
+2: Lose 2 life, draw a card.
-3: Gain control of target Zombie or Necromancer.
-13: Return all creatures from all graveyards into play under your control.
4

Isn't this the same Ultimate as Vess? [searches Gatherer] Yes, it is, but at almost twice the cost:
-8: Put all creature cards in all graveyards into play under your control.Also the second ability is extremely narrow and overly costly for the effect, compare it with the cheaper, better version of the same effect on Nicol Bolas, Planeswalker:
-2: Gain control of target creature.It would require your opponent to have Zombies or Necromancers which are honestly not the most common tribe. If you had a generic effect that made everything a Zombie or Necromancer like Dralnu's Crusade does with Goblins, only then could you steal something. The fact that you would need an extra effect to even make it viable, could I suggest adding power to this effect, making it a generic control Magic effect and/or reducing the cost. You are only starting off with 4 loyalty after all.
Just throwing ideas off the top of my head, if I were doing a zombie heavy theme on a PW, maybe a cheap Corpse Dance type effect would be an interesting untimate. Being able to Zombify + haste + RFG can be a powerful tool, moreso if it can effect your opponent's graveyard. Maybe an Innocent Blood effect on 2 to feed the graveyard and a token effect on one to protect Shanzar a bit:
+1: Put a 0/1 Thrull token into play.
-2: Each player sacrifices a creature.
-5: Return the top creature card from target graveyard to play. That creature gains haste until end of turn. Remove the creature from the game at end of turn.
3
Sure, not very original, the first is a weaker Elsbeth, but the second and ultimate compliment each other directly while the first gets you there. The costs are affordable and attainable and it's not a copy of Jace 1, Bolas 2 & Vess 3, it's a destinct flavour all to himself. Looking at Vess, she's actually quite slow ramping from hitting play to going Ultimate: 4 turns and 3 of those 4 turns is depriving your opponent of a resource. Shanzar doesn't effect your opponent at all if he's not making Zombies/Necromancers and, in fact, while you're ramping him to ultimate in the 6 turns it will take to get there, you will have spent 10 life to net 5 cards and you'll most probably be dead (4 loyalty, 5 turn of ability 1 to take him to 14 = 10 life) If you're somehow not dead, you're either goldfishing or he's milling you.
I think you can get something more "Zombie, brains, brains" than you have above and with much, much cheaper costs. You need to impact your opponent before the ultimate and you need to hit ultimate much, much quicker or have your second much more powerful. For info & a guide on how you need to benefit along the way, here's how long it takes for each PW to get to ultimate (counting the turn it's played as one turn):
Garruk: 2 turns, 2 untapped lands = Overrun
Tezzeret: 2 turns, 2 untapped Artifacts = March of the Machines
Bolas: 3 turns, 2 Destroy target noncreature permanent effects = Nicol Bolas
Sarkhan: 3 turns, 2 +1/+1 & haste for your full team = 5x 4/4 dragons
Adjani Goldmane: 3 turns, +4 life = Avatar (though recent history tells us that may just as well be blank as he's only used for his second ability which makes him even more powerful as you're essentially going "Ultimate, Ultimate, Ultimate, Charge him up, Ultimate etc.")
Lilliana: 4 turns, 3 discard effects = Zombify everybody under your control (though, again, her Vampiric Tutor is a lot more attractive than waiting for the ultimate and may even get here there depending on what card you tutor up.)
Chandra Nalaar: 4 turns, 3 damage to player = Lavalanche for 10
Adjani Vengant: 5 turns, 4 remains tapped effects = One sided Geddon
Elspeth: 5 turns, either four 1/1 soldiers or four +3/+3 & flying effects or a mix of both. = Your permanents are indestructable
I'll slip Shanzar in here:
Shanzar: 6 turns, lose 10 life, draw 5 cards = Put all creature cards in all graveyards into play under your control.Jace: 8 turns, 7 cards = Mill for 20 (though again he's more used for his second than ultimate, Sanity Grinding deck aside)
So you see what I'm getting at here? The ones that take longer to ultimate can protect themselves or have a much better second ability. at

you really want players to say "Ok, I have to be mono-

but
LOOK what I can do!!"
Hum, that ended up longer than I had planned.
Sorry.