One quirk of Spectacle is that if an opponent leaves the game after losing life (such as if they conceded or were knocked out), they're still classed as a player who lost life that turn, so you can still use it Spectacle

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Speaking of Lord of Change, there are very few cards in the game that have such a strong enters the battlefield trigger
Ns PP Up Item Attach a Basic Energy card from your discard pile to 1 of your Benched Ns Pokmon
The fact that the effect is harder to stop and exiles is a pretty big deal against some things but again, the seven mana price tag means you probably run Degalmour or Krosan Grip if you really need that kind of security in your answers
4) Ingenious Infiltrator Cards like Toski, Bearer of Secrets are phenomenal card advantage engines for decks that want to be attacking in combat