I can see great synergies with sacrificial altar and/or Graveyard.
Since the only way for the enemy to deal with sardo is by chopping him down or tele him like crazy.
Combine Your mighty dragon with the new Rolling thunder, and voilá he eats them teleports like nothing. That being sad i want to mention that rolling fog works pretty good with a (zombie) necro anyways, forcing enemy to come closer to your stuff when attacking, all you want, eh?
Even if your opponents tries to chop him, if you have a graveyard out, that almost a free brute next round, nothing to laugh at either.
Am i right when turning the blight of all living to my eternal servant, that pierce +1 would add to his zone attack too?
Bit sceptical about the slow down effect of the sunfire amulet though, thats still 5 spellbook points for necro would be one of my top priority dissolves, id rather pack a drain soul or the rolling fog instead and grab another curse on top.
I see alof of potential for this bad boy 
Just my few cents
There is another option for dealing with Sardo:
simply ignore him, and attrit your opponent faster. 5 dice plus piercing +2 is just not that much damage for 24 mana.
Lets do the math. My first thought was to compare Sardo against two midrange undead creatures totaling 24 mana, but that neglects the opportunity cost of a full round action to summon the second creature and likely mana discount for [mwcard=DNQ02] Death Ring[/mwcard]. Here is an accurate comparison:
Sardo StrategyTurn N: full round action to meditate for +3 mana (assumes Meditation Amulet, which is not a bad assumption for a Necromancer).
Turn N+1: summon Sardo for 23 mana (assumes 1 mana discount for Death Ring. Sardo's net cost is 20 mana over 2 full round actions)
Turn N+2: Sardo leaps into action doing 5+2p, or possibly 5 sweeping
Alternate StrategyTurn N: summon [mwcard=DNC22] Zombie Brute[/mwcard] (10 mana) or [mwcard=DNC14] Skeletal Knight[/mwcard] (12 mana) (both assume Death Ring discount)
Turn N+1: Zombie Brute swings for 4+2 bloodthirsty, or Skeletal Knight swings for 5 dice. Summon second [mwcard=DNC22] Zombie Brute[/mwcard] (10 mana) or [mwcard=MW1C32] Skeletal Sentry[/mwcard] (7 mana)
Turn N+2: Zombie Brutes swing twice for 4+2 bloodthirsty each or Skeletons swing for 5 & 4 dice (9 total).
Yes, Sardo has the advantage of massive health but the 2 midrange creature strategy has reasonable health, swings one turn earlier, and takes more actions & mana to thwart with teleport or other tricks. Sardo is also 2-3 more spellbook points.
Some posters mentioned [mwcard=MW1I08] Drain Life[/mwcard] as a good option, but in my experience Drain Life / Drain Soul are risky. You have to be very sure your opponent did not drop a Nullify or Reverse Magic on his mage.
Admittedly have not played any games with Sardo, but it is hard to see how he is competitive compared to other strong options. Perhaps the playtesters can give us some pointers.
