Midsummer Revels

At the beginning of your end step, target creature
you control gets +2/+0 and gains trample until
the end of your next turn. Then, if creatures you control have total power 8 or greater, sacrifice Midsummer Revels, then you may search your
library or graveyard for a card named Unhallowed Autumn, reveal it, and put it onto the battlefield.
If you searched your library this way, shuffle it.
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When the nights get longer, spirits and fae celebrate.