Cheapest priced copy (Double Masters): $9.49 at Card Kingdom, near mint, their price list as of .
Sword of War and Peace 
Artifact — Equipment · Mythic · Double Masters · #300
Equipped creature gets +2/+2 and has protection from red and from white.
Whenever equipped creature deals combat damage to a player, this Equipment deals damage to that player equal to the number of cards in their hand and you gain 1 life for each card in your hand.
Equip {2}
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
8 printings · $9.49 to $199.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Double Masters | 300 | Mythic | $9.49 | $14.99 |
| Double Masters | 367 | Mythic | $32.99 | $34.99 |
| Kaladesh Inventions | 51 | Special | — | $199.99 |
| New Phyrexia | 161 | Mythic | $12.99 | $19.99 |
| Judge Gift Cards 2023 | 5 | Mythic | — | $13.99 |
| The List | 2XM-300 | Mythic | $9.99 | — |
| Secret Lair Drop (Shield of War and Peace) | 1730 | Mythic | $14.99 | $17.99 |
| Secret Lair Drop (Sword of Power) | 2793 | Mythic | $13.99 | $14.99 |
One ruling from Wizards of the Coast
- 1 June 2011You count the cards in the each player's hand when the triggered ability resolves.