All of our Premodern, cEDH, Legacy, and Vintage events, you will be allowed to use playtest cards for these events for any card with value over $50 (we sell cards, we would like to keep selling cards, but stuff is still expensive so hoping to alleviate that a bit for you all).
A playtest card is anything that has the text of a Magic card but is not designed to look like an actual printed Magic The Gathering card (aka a counterfeit). Anyone using a counterfeit in the store will be DQ'd without refund.
Cost
$25
Source
Wizards of the Coast Event Locator
Listings can be incomplete or out of date. Always confirm details directly with the store or event organizer before heading out.