Cheapest priced copy (The List): $0.35 at Card Kingdom, near mint, their price list as of .
Command of Unsummoning 
Instant · Uncommon · Portal · #48
Cast this spell only during the declare attackers step and only if you've been attacked this step.
Return one or two target attacking creatures to their owner's hand.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper