As sealed product becomes nearly impossible to find, copies of Erika have climbed steadily, peaking at $100
The reason I say this will be better in Modern than Commander is down to one factor: consistency
However, stock often sells quickly, and some items have limits on how many you can buy
When you have your countermagic ready, equipping this to your samurai token or whatnot to make it their Sheoldred, the Apocalypse or something worse seems really nice
Ghostly Drakes Cards: Ghostly Flicker + Peregrine Drake + Archaeomancer Prerequisites: You control both creatures, can cast Ghostly Flicker, and have lands that tap for at least 4 mana
You can kill the token after that point, but the equipment is already attached (and if the token is destroyed, the job select equipment remains on the battlefield as with any other equipment)