#1 Iconic Interferences:

WWE Super Showdown will feature Goldberg battling The Undertaker for the first time ever. The match has been in the making for nearly 22 years now. Although people think that the match will not be as entertaining as it would have been 10 years ago, the nostalgic factor associated with it will cover up for most of the flaws.
Moreover, we can witness a few interferences throughout the match. Similar to last year's Super Showdown event, Kane could appear to assist his (kayfabe) brother, The Undertaker. This would make sense as Kane actually has history with Goldberg.
On the other hand, the Icon could come to the aid of his WCW rival Goldberg and even the odds. Sting interfering could also help in setting up a Sting/The Undertaker match at the next Saudi event. The reason why this move makes sense is that Sting was recently announced for Starrcast 3, taking place during the weekend of AEW All Out. WWE might give Sting a match against The Undertaker and have him abandon the Starrcast appearance.
Even if it's not for setting up a match, the interferences can be used as nod to the idea that The Undertaker/Goldberg match is more about WWE vs. WCW. The two legends have nothing else to fight for against each other, so this approach (though overused) could work and give fans a remarkable moment.