In Magic: the Gathering, you build a deck of spells and then cast those spells from your hand in an effort to reduce your opponents health to zero
But ultimately, I think this will end up being one of the cuts we make to upgrade the deck, as this is a bit lacking as a win condition, its most common use-case likely being to simply gum up the ground a bit
We've looked through the past as well, with uncommon legendary creatures that were printed years ago, and even commanders that were originally printed as rares and have been downshifted over time, like Zada, Hedron GrinderZada, Hedron Grinder and Bladewing the RisenBladewing the Risen
It also helps that this is a very cheap way to both save your creatures and start the ball rolling with proliferate and counters-moving tomfoolery, so get your copies cheap while you can
Usually, you can consider 200 gems equal to 1,000 gold