How many of these have you opened
An Amethyst/Steel Frozen deck, or a Villain deck, which could result in any combination of Amethyst, Ruby, or Emerald
Genesis Chamber 7/10 This is quite the big risk card but it does offer huge returns, likely more so than any other support card you can add
Narset of the Ancient Way is probably the best option: while she incentivizes casting spells over cycling them, her minus ability allows you to draw extra cards with the option to discard them to damage your opponents creatures, or to keep them and cycle them later
The official Secret Lair website has a support page where you can keep track of the production and shipping status of any Secret Lair you've ordered
The last card that was NOT part of the main set for Ikoria: Lair of Behemoths was indeed Godzilla, King of the Monsters