Kefnet Thoth the Wise

Extend : {w/b}{w/b}{w/b}{w/b}{w/b}
You can play this card for its Extend cost and
if you do , you can sacrifice three cards in a pile :
Add one Sorcery or Artifact with cost {4} or
lower from your deck to your hand .
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When Kefnet Thoth the Wise enters the
battlefield , Combine all your piles into one.