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The World's effect landing on Heads lets you tribute 2 monsters at the end of your turn to skip the opponent's

That could be Esper Sentinel , Serra Ascendant , Mother of Runes , or whatever utility piece your deck relies on

When its sent to the Graveyard, you can add a Shaddoll card from your Deck or Graveyard to your hand, and then discard a card so you can immediately use another Shaddoll Graveyard effect

If it's a permanent spell, the copy gains haste and "At the beginning of the end step, sacrifice this permanent." (A copy of a permanent spell becomes a token.) Whenever you cast a spell from exile, copy it