We dont know he is a seasoned spell caster. The canon on his powers is limited to one game & he isnt even the best character.
I don't think Taker has access to these cool magical powers ED is talking about. I respect the hell out of the argument and it's very interesting, but it's all theoretical. We've never seen Taker use these spells and there's no reason to believe that he can beyond his lightning abilities.
For Heaven's sake, Wolverine is
ridiculously overpowered. I'm not presenting these arguments so I can impress anybody, I like the idea that a few of these fights can be at least a little fair.
For all the insane abilities that Wolverine is apparently allowed to have, I think it's fair to associate an Undertaker who identifies as a Necromancer with
other Necromancers. As you both have pointed out, this is all we're given in terms of backstory to this BattleZone competitor:
I'm not calling him the greatest Necromancer in all of fantasy lore, I'm looking at him as a semi-decent spell-caster who finds himself going up against an enraged lunatic in an arena that's vibrating with magic power.
The transmutation spell is one option he has. To Wolverine, this would be just another fight where he just has to go ape-shit to win. To Undertaker, this is a game of chess where he has to play his game very carefully. If Wolverine gets to just shred anything with his claws, then Undertaker at least gets a few moments to strategically think this battle through.
It's been mentioned that Wolverine's well known (especially to a Necromancer who could sense life auras) healing ability counters the toxicity of his skeleton. Here's something that happened recently to Wolverine in regard to that:
Wolverine's healing advantage, can be his biggest weakness in terms of what would happen if it were negated, which is apparently possible in the Marvel world. There would be no "good news" from Beast if Undertaker was able to deduce that poisoning Wolverine with a strong enough life drain would actually cancel out his healing ability. Wolverine with no healing ability would be a major shock to his metabolism.
Have I made it obvious enough that I'm a D&D geek yet?
Undertaker does cast lightning in WWE Immortals, which by the way
isn't a common spell in
the most recent Necromancer's Spell list. Through the same link, one can research that lightning bolt is a 3rd level Sorcerer spell that Undertaker can apparently just cast at will. Notice that another few 3rd level Sorcerer spells are "slow" and "haste", which would both be high priorities of Undertaker's to even the odds in this encounter. If he's so advanced in his studies that he can cast a spell from a class that he's only studying on the side, I'm sure he could pull off
Black Lightning.
In reference to the question if Undertaker could pull off a lightning bolt strong enough to mimic Storm's, the link I shared has this fun snippet:
"Far away, wherever your enemies may be, they are suddenly stricken by a snarling bolt of negative energy that tears through stone and sky alike. It is not stopped even by lead and cannot be evaded no matter what. Even after the first jolt, a second follows, and a third after that. The air is filled with their shrieks of agony as excruciating pain fills them and overcomes them, tearing their soul from their body and banishing it to the nine hells forever."
For reference,
here's a layout of The Chamber of Secrets.
Undertaker slows Wolverine at the entrance, hastes himself, makes his way to the Statue of Slytherin and sets magic traps along the way. A life drain ward is placed to ensure that if Wolverine makes it there in time, he'll at least be a fair opponent. He has a transmutation scroll handy
just in case. Undertaker begins the ritual of Black Lightning and the rest is up to our imaginations.
I think that Undertaker would prove to be too crafty an opponent for Wolverine.
