A Sulfuric Vortex on legs that is both more AND less resilient than the original, and this swimming Giant. They're really powering up Giant tribal for this set. . . and also confusing Rogue tribal players (of course you don't play Undersea Invader outside of not having enough Giants in Limited).
If the cant gain life would still work from the grave too , this would be an amazing bomb.
All this anti-destroy creature effects make me wonder if they will basically only print "exile" removal from now on, as destroying anything is totally terrible if everything either returns from the grave or has some ability from the grave.
They're really trying to make Giants a thing, huh. Well, the tribe needs the support because they won't be appearing all that much once we leave Kaldheim. Quakebringer certainly seems good. If there are some good CMC2-3 Changelings in blue, Izzet Giants could become at least FNM playable.
Undersea Invader is a funny concept for a Giant Rogue.