At the start of each players upkeep they have to pay one mana for each of their creatures, and if they cant, that creature is destroyed
However, Wizards of the Coast has sometimes released original cards as part of crossovers with other franchises
When Yawgmoth, Thran Physician released in Modern Horizons, we saw a similar spike, and the price has never really dropped back down since then
You can preorder all the Phyrexia: All Will Be One goodness from Amazon, Best Buy, or your FLGS here
If you dont need or want to board wipe right away, you can set up The Phasing of Zhalfir to go off in 1 or 2 turns, phasing out a creature you really want to keep if your enchantment survives long enough to nuke the board, or temporarily removing a big or indestructible threat that you arent able to deal with in any other way