Movement needs history, and history accumulates one scan at a time. Nothing here will be meaningful until you've been scanning for at least a couple of weeks — 4 snapshots minimum before a direction gets labelled at all. Tracking 32 cards so far.
Falling prices are where the actual bargains are — but check why before buying. A reprint, a rotation, or a population spike means the price keeps sliding after you're holding it.
No falling cards identified yet. Keep scanning — movement needs several snapshots per card before it can be measured.