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Released in 2002, ONSLAUGHT is the first set in the ONSLAUGHT BLOCK (Onslaught, Legions, Scourge). This is a 350 card set.
Look for the following key cards:
Cover of Darkness
Jareth, Leonine Titan
Kamahl, Fist of Krosa
Silvos, Rogue Elemental
Visara the Dreadful