Dawning Spring

At the beginning of your upkeep, exile Dawning
Spring and search your library for a card named
Summer Abloom. Put it onto the battlefield and shuffle your library. Then gain 5 life.
{w}{u}{b}{r}{g}, Shuffle four season cards with
different names you own in exile, including this
card into your library: Search your library for a creature named Kayelthos, God of Seasons, and
put it onto the battlefield. Shuffle your library.