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The idea behind this deck is to flicker your creatures to reuse their ETB effects. Reaper King is not absolutely necessary for the deck to function properly, but he complements it nicely since he gives all scarecrows an ETB effect.
For giggles, assemble the scarecrow Gatling gun by getting all three changeling champions out at the same time as the Reaper King!
This deck has seen lots and lots of revision. The original version was much too dependent on Reaper King making the bad scarecrows playable. As such, all but the strongest Scarecrows (and changelings) have been cut.