For the chase of the entire set (so far) look no further than Tamatoa Happy as a Clam Enchanted
Pool together [c]crab[/c], [c]octopus[/c], [c]fish[/c], [c]squid[/c], [c]shark[/c], [c]whale[/c], and [c]dolphin[/c]
(It's an artifact with ", , Sacrifice this token: Search your library for a basic land card, put it onto the battlefield tapped, then shuffle.") Return target creature or Spacecraft card with mana value 5 or less from your graveyard to the battlefield
He looks like those seals when they get their noses booped, squishing their necks down until its practically non-existent
We can also use Wrenn and Seven or Nissa, Vital Force to return permanents from our graveyard to our hand, which can lead to some really weird legend-rule loops where we play multiple Ugin, the Spirit Dragons or Nissa, Who Shakes the Worlds, use their abilities, with each copy legend-ruling away the first, return them all to our hand with Wrenn and Seven, and eventually kill our opponent with Ugin damage or a massive Nissa, Who Shakes the World land (which gets especially massive thanks to the extra counters from Doubling Season)