Cheapest priced copy (New Capenna Commander): $0.99 at Card Kingdom, near mint, their price list as of .
Threefold Signal 
Artifact · Mythic · New Capenna Commander · #111
When this artifact enters, scry 3.
Each spell you cast that's exactly three colors has replicate {3}. (When you cast it, copy it for each time you paid its replicate cost. You may choose new targets for the copies. A copy of a permanent spell becomes a token.)
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
2 printings · $0.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| New Capenna Commander | 93 | Mythic | $0.99 | $0.99 |
| New Capenna Commander | 111 | Mythic | $0.99 | $0.99 |
One ruling from Wizards of the Coast
- 29 April 2022If you cast a spell that already has replicate while you have this permanent on the battlefield, the spell will have two replicate abilities: one with a replicate cost as printed on it, and one with a replicate cost of {3}. You may use either ability, or both abilities, to replicate the spell.