Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Imps' Taunt 
Instant · Uncommon · The List · #TMP-138
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 attacks this turn if able.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper