It becomes a Mutant in addition to its other types
There are plenty of other low-cost cards which can replace Wooded Foothills in this example, not just other lands like Krosan Verge (obviously better if youre also playing white), but spells like Natures Lore or creatures like Wood Elves
Speaking of Floodgate and Scourge of Fleets, we're running a ton of amazing cards that reward us for going full-on Islands: Spectral Deluge is another amazing one-sided wipe, Engulf the Shore is an amazing emergency wipe at instant speed, we've got Flow of Knowledge and Flow of Ideas to draw absurd amounts of cards, and we also got all the mana doublers like Gauntlet of Power and Caged Sun to cast all the spells so we can still pop off even without Eluge
Because the token is a copy, it has the ability too
Witherbloom n Golgari has also had a mechanically unique Commander at the top of players to-build piles lately: Lathril, Blade of the Elves
With the right support, it could definitely come together, and the payoff of getting an additional 2/2 plus a land is definitely worth going for
