Spell #98890 (possibly named "Foothold Credit See Invis And Phase Switch") doesn't exist. It may have been removed from the game.
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Foothold Credit, See Invis, and Phase Switch - Live
Foothold Credit, See Invis, and Phase Switch - PTR
Foothold Credit, See Invis, and Phase Switch - PTR 2
Foothold Credit, See Invis, and Phase Switch - Beta
Foothold Credit, See Invis, and Phase Switch - Cataclysm