Cheapest priced copy (Modern Horizons 2): $0.35 at Card Kingdom, near mint, their price list as of .
Galvanic Relay 
Sorcery · Common · Modern Horizons 2 · #127
Exile the top card of your library. During your next turn, you may play that card.
Storm (When you cast this spell, copy it for each spell cast before it this turn.)
Legal inCommanderModernLegacyVintage
Banned inPauper
Not legal inBrawlStandardPioneer
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 2 | 127 | Common | $0.35 | $0.49 |
| Modern Horizons 2 | 406 | Common | $0.35 | $0.49 |
2 rulings from Wizards of the Coast
- 18 June 2021You can play the exiled card only on your next turn after Galvanic Relay resolves. Notably, this means you cannot play it the same turn you cast Galvanic Relay.
- 18 June 2021Playing the card has the same timing restrictions and requires the same payments as normal, but it can only be played next turn.