Cheapest priced copy (Champions of Kamigawa): $2.99 at Card Kingdom, near mint, their price list as of .
Tide of War 
Enchantment · Rare · Champions of Kamigawa · #194
Whenever one or more creatures block, flip a coin. If you win the flip, each blocking creature is sacrificed by its controller. If you lose the flip, each blocked creature is sacrificed by its controller.
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
1 printing · $2.99 to $12.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Champions of Kamigawa | 194 | Rare | $2.99 | $12.99 |
3 rulings from Wizards of the Coast
- 1 December 2004Tide of War’s controller always flips the coin. This means that you want to win the flip when you’re attacking but lose the flip when you’re defending.
- 1 December 2004Even if the blockers are sacrificed, any attackers that were blocked are still considered blocked.
- 1 December 2004Tide of War’s ability triggers only once each combat and only if at least one blocker is declared. The effect does nothing to unblocked attacking creatures.