Cheapest priced copy (Odyssey): $0.35 at Card Kingdom, near mint, their price list as of .
Rites of Initiation 
Instant · Common · Odyssey · #217
Discard any number of cards at random. Creatures you control get +1/+0 until end of turn for each card discarded this way.
Legal inCommanderLegacyVintagePauper
Not legal inBrawlStandardPioneerModern