Bralnu, Sea's Architect

Shroud, Trample, Reclamation
Whenever you cast Bralnu or a Legendary
Sea Monster spell, take an extra turn after this one.
If you are playing as The Sea, Bralnu gains the
ability; At the beginning of your upkeep, if you
control 7 or more lands, search your library for
an Instant, Sorcery, or Creature Card and put it
into your hand, then shuffle your library.