Summer's Growth

At the beginning of your end step, search your
library for a basic land card, reveal it, and put it
into your hand. Then, if you control six or more
lands, sacrifice Summer's Growth, then you may search your library or graveyard for a card named Midsummer Revels, reveal it, and put it onto the battlefield. Then shuffle your library.
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When the land warms after ample rain, growth is
constant and unstoppable.