Cheapest priced copy (Commander Legends): $0.49 at Card Kingdom, near mint, their price list as of .
Archelos, Lagoon Mystic 
Legendary Creature — Turtle Shaman · 2/4 · Rare · Dominaria United Commander · #140
As long as Archelos is tapped, other permanents enter tapped.
As long as Archelos is untapped, other permanents enter untapped.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
3 printings · $0.49 to $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Commander Legends | 268 | Rare | $0.49 | $0.99 |
| Commander Legends | 588 | Rare | — | — |
| Dominaria United Commander | 140 | Rare | $0.49 | — |
3 rulings from Wizards of the Coast
- 10 November 2020Archelos's abilities don't apply to itself as it enters the battlefield, nor do they apply to any permanents entering the battlefield at the same time.
- 10 November 2020If more than one Archelos is on the battlefield, the controller of an entering permanent chooses how to order the replacement effects.
- 10 November 2020If another replacement effect says that a permanent enters the battlefield tapped while Archelos is untapped, the entering permanent's controller chooses whether the permanent enters tapped or untapped. If a permanent is simply put onto the battlefield tapped without a replacement effect being applied, it always enters untapped if Archelos is untapped.