The average Eldrazi threat really doesnt need much of a boost from typal support cards to end a game
Cards like Lodestone Golem, Thorn of Amethyst, and Phyrexian Revoker hadn't been printed when Storm was at its peak
But it's also true that selling random booster packs will likely encourage spending over a longer period of time, as players hunt specific cards
Secondly, it combines at least three of the monochrome 'cosmium ink' variants of Lost Caverns Mana Crypt (red, green and yellow) into one spectacular card
One reason is likely the patch embedded in the card, which features three colors and seven "breaks" according to the auction house
Then once "Bal Teah" is sent to the GY for a Synchro Summon, it lets the user Fusion Summon by banishing itself and "Polymerization" from the GY if a monster is Special Summoned to the opponent's field, offering an opportunity to fuse