To have access you must have a Gnifty Gnome Hybrid in your wallet:

**** Odds - Card Rarities & Max Lvls ****

Holo - 250 (Max Mint: 1) - 0.20%
Gold Shimmer - 250 (Max Mint: 2) - 0.40%
Rainbow Shimmer - 240 (Max Mint: 5) - 1.02%
Red Shimmer - 225 (Max Mint: 10) - 2.04%
Green Shimmer- 210 (Max Mint: 20) - 4.09%
Purple Shimmer - 200 (Max Mint: 50) - 10.24%
Blue Shimmer- 175 (Max Mint: 100) - 20.49%
Common -100 (Max Mint: 300) - 68.49%