In the old death wave, the advantage of playing wave on T5 is that, you can play more than one card, but the opponent can't. It was a powerful ability and ultimately got nerfed.
Now, wave sets everything to cost 4. That means, if you play wave on t5, you need 8 energy to play two cards. Electro should give you one extra energy and X23 the other.
Assuming X23 is already on board, destroying Electro on T4, means we have 6 energy on T5. Playing wave on X23's location, and destroying it with Deathlok or Carnage, should give us 8 energy.
This seems like a very hard combo to pull off, but when we do, we could do Nimrod + Zola or Destroyer + Nimrod on T6.
Other Win Cons rely on getting Nimrod on to the board on T4 and destroying it for the next two turns.