Playset no longer has a contract of its own. A slab sits inside a Metaplex Core wrapper, its 100 units trade through Metaplex's Hybrid escrow, and a small signing service co-signs each trade; unwrapping is free and hands back the slab. A first pool ran on mainnet and was unwound on purpose to measure the whole cycle. Pools of recent cards come next.

The case study: https://x.com/meexworks/status/2105933558284202131
The week's write-up: https://x.com/meexworks/status/2106510105755951167