SIRs appear ~twice as often as normal (~1 in 45 packs) but with 32 SIRs in the pool, each specific SIR is ~1 in 1,440 packs
When you see a card numbered 114/113 or 147/146, thats a secret rare, and the concept started here
And for an instant win setup, pairing it with Wound Reflection means a player with 20+ life drops down to 10 and then immediately falls to 0 at end of turn a simple two-card combo that ends games fast and dramatically
For instance, if you use something to phase out your opponents creatures and then resolve Stasis, those creatures wont phase back in because there wont be an untap step for them to return to the battlefield
This visual appeal, combined with Gengars massive popularity, has kept demand at a fever pitch since its January launch
The cards' mechanics fit the newly designed creatures, and the new versions have the set code of the Secret Lair printing at the bottom to avoid confusion