You'd almost always want to start the game with a Dialga ex
Lost Caverns of Ixalan Commander (LCC) #120 Illustrated by Chris Ostrowski Magic: The Gathering, MTG Brand: Magic The Gathering Company: Wizards of the Coast Item Type: Single Card UPC: 0611816108356 Stock #: 456057 Our Guarantees to You, Our Valued Customer
Many Decks include monsters and effects that banish cards from their GY to use them
Since it was only ever printed in the MTG set Saviors of Kamigawa, Ashes of the Fallen is pretty susceptible to price spikes
You put the people who you want to test your products in a room, and then you go sit on the other side of a two-way mirror and watch them

Ayara's Oathsworn Beseech the Mirror Beseech the Queen Bogbrew Witch Brainspoil Bringer of the Black Dawn Case of the Stashed Skeleton Coveted Prize Cruel Tutor Cynical Loner Dark Petition Demon's Herald Demonic Bargain Demonic Collusion Demonic Tutor Diabolic Intent Diabolic Intent Diabolic Tutor Dimir House Guard Dimir Machinations Emeritus of Woe Entomb Gravebreaker Lamia Grim Servant Grim Tutor Hoarding Broodlord Hour of Victory Illicit Shipment Imperial Seal Increasing Ambition Infernal Tutor Insatiable Avarice Liliana Vess Lively Dirge Mastermind's Acquisition Netherborn Phalanx Oriq Loremage Profane Tutor Razaketh's Rite Razaketh, the Foulblooded Rhystic Tutor Rune-Scarred Demon Servant of the Stinger Shred Memory Sidisi, Undead Vizier Smuggler Captain Splinter's Technique The Creation of Avacyn The Cruelty of Gix Urborg Panther Vampiric Tutor Vile Entomber Whisper Squad Wishclaw Talisman Witty Demon (playtest)