Possible combos:

Patron+defile (with 1+2 health minions on board) clears and leaves 4 patrons.
Patron+elven archer (targetting patron)+defile clears and leaves 6 patrons.
Howlfiend+treachery+dark skies discards 6 opponent cards on empty board.
Doomsayer+treachery clears
Patron+elven archer+defile+howlfiend+treachery clears, discards 6 cards and leaves 6 patrons.

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