There are 3 more monsters that become Umi and mention Atlantis (plus the Advent of Atlantis Continuous Spell Card), so youll have plenty of Umi to flood the field
Cards found in Prerelease Packs that create Bilbo's Birthday Party scene are foil-stamped traditional foils, and cards from the Bundle and Bundle: Gift Edition that create the Mount Doom scene come in traditional foil
Its serpentine design, reminiscent of Eastern dragon mythology, underscores its ethereal presence, with long, flowing appendages and a majestic green hue that commands attention
Which is also the problem with Collector Boosters
If Primeval Spawn would enter the battlefield and it wasnt cast or no mana was spent to cast it, exile it instead makes it so you cant Reanimate, Sneak Attack or Polymorph it into existence and this design choice feels very deliberate