Cheapest priced copy (Modern Horizons 2): $0.99 at Card Kingdom, near mint, their price list as of .
Karmic Guide 
Creature — Angel Spirit · 2/2 · Rare · Modern Horizons 2 · #263
Flying, protection from black
Echo {3}{W}{W} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.)
When this creature enters, return target creature card from your graveyard to the battlefield.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
11 printings · $0.99 to $249.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Forgotten Realms Commander | 68 | Rare | $1.29 | — |
| Commander 2013 | 14 | Rare | $1.29 | — |
| Commander Anthology | 13 | Rare | $1.49 | — |
| Eternal Masters | 17 | Rare | $1.29 | $5.99 |
| Judge Gift Cards 2012 | 4 | Rare | — | $20.99 |
| Modern Horizons 2 | 263 | Rare | $0.99 | $4.49 |
| Secret Lair Drop | 281 | Rare | $7.49 | $6.49 |
| Secret Lair Drop | 1911 | Rare | $19.99 | $24.99 |
| Secrets of Strixhaven Commander | 151 | Rare | $0.99 | — |
| Urza's Legacy | 11 | Rare | $6.49 | $249.99 |
| Crimson Vow Commander | 90 | Rare | $0.99 | — |
2 rulings from Wizards of the Coast
- 18 June 2021Your permanent's echo ability will trigger at the beginning of your upkeep if it entered the battlefield since the beginning of your last upkeep, or if you gained control of it since the beginning of your last upkeep.
- 18 June 2021Paying for echo is always optional. When the echo triggered ability resolves, if you can't pay the echo cost or choose not to, you sacrifice that permanent.