Yes, Lathliss, Dragon Queen is a key card in 1 combo(s) in our combo database, linked from the Combos section of this page
Theres only one slot in each of these boosters for one of the new cards, and there are only 29 new cards that can be found in this set
There are 3 uncommon scene cards that can be found in these slots
Conclave Evangelist Conclave Evangelist creates a herd of threats if your opponents waste time with mana rocks and such instead of removal spells
We chose this Rainbow Rare because its one of the most mathematically difficult pulls in modern history, given the massive 236-card checklist of Unified Minds
Its finding one that reliably passes the shuffle test : consistent thickness, clean cuts, readable text, and a finish that doesnt feel like your deck is half playing cards and half cereal boxes