Sure, the market fluctuates, but thats still going to be head and shoulders above most products for them in terms of profit
$0.79 Armor of Shadows Commander Legends: Battle for Baldur's Gate $3.49 Feign Death Adventures in the Forgotten Realms $7.99 Saw in Half Bloomburrow Commander Decks $0.49 Demonic Gifts Kaldheim $3.99 Impact Tremors (0044) Wilds of Eldraine Enchanting Tales $2.49 Not Dead After All Wilds of Eldraine $0.99 Demonic Vigor Dominaria $0.99 Fear, Fire, Foes
You can check out the Secret Lair page for more information
With all of these mana sinks, it's very unlikely that you'll ever have mana unspent
The odds of each of the five cards in a Wonder Pick are all equal, so you have a one-in-five chance of pulling one of the rarest cards in the game for yourself
For each card you acquire after your fourth copy, that card is converted into Vault Progress Points according to its rarity: The Vault opens when you reach 1000 Vault Progress Points and unlocks: 1 Mythic Wildcard 2 Rare Wildcards 3 Uncommon Wildcards Note: the Vault is hidden until it has filled