Secret Arcade, Nylea's Colossus, Thoughtrender Lamia, Ondu Spiritdancer, and Sphere of Safety give you huge advantages with tons of +1/+1 counters, forced discard, or the hinderance of attacks to name a few
Crew 1 makes it very easy to have at least a few of them active each turn, and you only actually have to sacrifice three permanents to turn the entire fleet into flying creatures
You usually swap cards for others that are probably not very good in specific matches
Is sealed product safer than singles
Amazing Acrobatics An Offer You Can't Refuse Annul Brush Off Cancel Confounding Riddle Dazzling Denial Detect Intrusion Disdainful Stroke Dispelling Exhale Diversion Unit Divert Disaster Don't Make a Sound Drix Interception Essence Scatter Fangkeeper's Familiar Fear of Impostors Flashfreeze Fugitive Droid Get Out Glen Elendra Guardian Hurl into History Ice Out It'll Quench Ya
Each Secret Lair DnD drop will retail for $29.99 USD, with the Foil Edition going for $39.99 USD