Cheapest priced copy (Assassin's Creed): $11.99 at Card Kingdom, near mint, their price list as of .
Sword of Light and Shadow 
Artifact — Equipment · Rare · Darksteel · #149
Equipped creature gets +2/+2 and has protection from white and from black.
Whenever equipped creature deals combat damage to a player, you gain 3 life and you may return up to one target creature card from your graveyard to your hand.
Equip {2}
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
10 printings · $10.99 to $119.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 298 | Mythic | $14.99 | $17.99 |
| Double Masters | 366 | Mythic | $32.99 | $32.99 |
| Assassin's Creed | 100 | Mythic | $11.99 | $10.99 |
| Assassin's Creed | 125 | Mythic | $20.99 | $22.99 |
| Assassin's Creed | 262 | Mythic | — | — |
| Darksteel | 149 | Rare | $15.99 | $37.99 |
| Judge Gift Cards 2012 | 7 | Rare | — | $34.99 |
| Modern Masters | 217 | Mythic | $13.99 | $32.99 |
| Kaladesh Inventions | 30 | Special | — | $119.99 |
| Star Trek Commander | 502 | Mythic | — | — |
2 rulings from Wizards of the Coast
- 7 August 2020If you choose a target creature card in your graveyard and that card is an illegal target by the time the triggered ability tries to resolve, the ability won't resolve. You won't gain 3 life. If you don't choose a target at all, you just gain 3 life.
- 7 August 2020The triggered ability can target a creature card that was put into your graveyard as a result of state-based actions immediately after the combat damage that caused the ability to trigger.