Cheapest priced copy (Stronghold): $0.35 at Card Kingdom, near mint, their price list as of .
Change of Heart 
Instant · Common · Stronghold · #3
Buyback {3} (You may pay an additional {3} as you cast this spell. If you do, put this card into your hand as it resolves.)
Target creature can't attack this turn.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern
1 printing · $0.35 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Stronghold | 3 | Common | $0.35 | — |
One ruling from Wizards of the Coast
- 4 October 2004Change of Heart will not remove an already attacking creature from combat. It must be cast before attackers are declared or it won’t have any noticeable effect on the game.