Cheapest priced copy (Odyssey): $0.35 at Card Kingdom, near mint, their price list as of .
Sacred Rites 
Instant · Common · The List · #ODY-44
Discard any number of cards. Creatures you control get +0/+1 until end of turn for each card discarded this way.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern