This is a very easy cheat to pull off if they understand randomness and you don't
3 Mox Diamond - From The Vault: Relics Mythic Rare - $774.98 Originally printed in Stronghold, Mox Diamond is an incredibly strong artifact that, much like Jeweled Lotus, can be expected to be valuable simply because it has the word Mox in its name
The Tender is a 1/1 that taps for mana equal to your colors, so that'll always count itself
Kari Zev, Skyship Raider (Red First Strike Legendary Creature) [c]Kari Zev, Skyship Raider[/c], is another legendary creature, but this time its a mono-red card
Vampiric Tutor, Impulse and Fireblast in all formats
All the cards featuring Astorian looking thirsty are pretty pricey too, however, so I wonder if we can expect Archmage's Charm to be the most desirable card here