The specific wording on Foul Rebirth doesnt even lend it well to Adventure-based decks that want to copy spells
For example, you may find a card that's black, green, and blue as the black card and still find a green card and a blue card
If all goes well, you ramp, created a token, and fueled your graveyard for more action in this very active Sultai card
BSJ and/or TM own a copyright and, in many instances, patents and other intellectual property in a Site and Content
You could also look to use spells that exploited your milled opponents like Spelltwine and Memory Plunder
Since cards printed in Commander decks are playable in Legacy formats (and also show up in spikier casual formats like Cube), players from those formats snapped up the precons, leading to shortages and decks being sold for well over MSRP