Cheapest priced copy (Nemesis): $0.35 at Card Kingdom, near mint, their price list as of .
Dark Triumph 
Instant · Uncommon · Nemesis · #55
If you control a Swamp, you may sacrifice a creature rather than pay this spell's mana cost.
Creatures you control get +2/+0 until end of turn.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper