Pick Webcam and hold a card to the camera, or Sample clip to play a pack-opening video. The real stream overlay appears over the video — the corner card with name, set, number, rarity and market value, plus a rarity-driven reveal effect (prismatic border for chase hits, glitter for shinies, a slam for ex/V, foil shimmer for holos).
Webcam needs a secure context (localhost or https). Over plain http to a remote host, use Sample clip.