I use the prices of the 10 most expensive cards divided by the price of a single pack (there has to be a decent quantity available)
C Common Chimera the Flying Mythical Beast X WIND Level 6 [ BeastFusionEffect ] ATK 2100 DEF 1800 "Gazelle the King of Mythical Beasts" + "Berfomet" (This card is always treated as a "Phantom Beast" card.) When this card is destroyed: You can target 1 "Berfomet" or 1 "Gazelle the King of Mythical Beasts" in your GY
In the event of a successful challenge to the title to any goods purchased pursuant to these Conditions of Sale and the exclusive remedies provided herein, University Archives agrees to reimburse any Bidder in an amount equal to the successful bid price actually paid by Bidder at auction plus any Buyer's Premium actually paid, in full and complete satisfaction of all claims, which once tendered by University Archives, relieves and releases University Archives from any responsibility whatsoever to the Bidder, even if the instrument is not cashed or is returned
Link Monsters are a lot more flexible for this Deck
Can You Get Legendary + Enchanted Cards In Starter Deck Packs + Loose Packs
No matter what you do with Teferi, it wont be fair