Aurelion Sol

Flying, Hexproof, Sunburst (+1/+1 counters)
When I enter the field, search your library for a
card with "Celestial" in its name with mana value
of 6+, place it in your hand, and shuffle.
Forgo your normal draw each turn to instead
search your library for a "Celestial" card, add it
to your hand, and then shuffle.
Limit Break (Transform me when conditions are met.
I keep all counters when flipped.) Creatures you
control have a total power of 20+.