Elide, Deranged Scarecrow

When Elide, Deranged Scarecrow enters the battlefield, if you cast it from the command
zone, choose an opponent. Instants and sorceries
cast by the chosen opponent have "Each player discards a card." in addition to its other text as
long as Elide, Deranged Scarecrow is on the battlefield.
Madness {b}{r} (If you discard this card, discard into
exile. When you do, cast it for its madness
cost or put it into your graveyard.)