Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
When Mephidross Slime dies, conjure (A conjured card is added to the game.) a card named Mephidross Slime into your graveyard. Perpetually double the power and toughness of Mephidross Slime and that card, then shuffle them into their owner's library.
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