When Mournwhelk enters the battlefield, target player discards two cards. Evoke (You may cast this spell for its evoke cost. If you do, it's sacrificed when it enters the battlefield.)
It hoards Lorwyn's rare sorrows.
Official Rulings for Mournwhelk
4/15/2013 : If you cast this card for its evoke cost, you may put the sacrifice trigger and the regular enters-the-battlefield trigger on the stack in either order. The one put on the stack last will resolve first.
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