Remembrance and Mirror Box go well when your cards have the same name, and there's a whole cycle of cards like Echoing Return and Echoing Courage that affect all creatures with the same name
Explosive Vegetations Ever since Nemesis gave us Skyshroud Claim for two Forests of anything out ramped for four-mana and usually tapped, this has been beloved (Those arrive untapped though)
Many also appreciate that items arrive in great condition, along with the nice set quality, cool accessories, and good availability
The deck plays tons of cheap spells to trigger it, and Conniving lets you discard copies of Arclight Phoenix and fuel Treasure Cruise
After all, the time delay between when someone requests a card to be graded and when it is back in their possession can be massive, which can be very frustrating for people looking to sell cards quickly