Cheapest priced copy (Secret Lair Drop): $19.99 at Card Kingdom, near mint, their price list as of .
Mesmeric Orb 
Artifact · Mythic · The Brothers' War Retro Artifacts · #94
Whenever a permanent becomes untapped, that permanent's controller mills a card.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
7 printings · $19.99 to $39.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 272 | Rare | $21.99 | $27.99 |
| The Brothers' War Retro Artifacts | 31 | Mythic | $20.99 | $32.99 |
| The Brothers' War Retro Artifacts | 94 | Mythic | $22.99 | $32.99 |
| The Brothers' War Retro Artifacts | 94z | Mythic | — | — |
| Mirrodin | 204 | Rare | $22.99 | $39.99 |
| Salvat 2005 | H13 | Rare | — | — |
| Secret Lair Drop (Mothman Egg) | 2457 | Rare | $19.99 | $20.99 |
One ruling from Wizards of the Coast
- 7 August 2020If permanents become untapped during the untap step, Mesmeric Orb's ability will trigger that many times. However, since no player gets priority during the untap step, those abilities wait to be put on the stack until the upkeep starts. At that time, any "beginning of upkeep" triggers will also trigger. Those abilities and Mesmeric Orb's triggers are put onto the stack at the same time.