When it ETBs or attacks, you can toss a flood counter on any land and It becomes an Island too, not as a replacement
But especially for a green deck that doesnt seem like an unreasonable limit on its power
According to The Commander Format Panel, "Game Changers dramatically warp Commander games, allowing players to run away with resources, shift games in ways that many players dislike, block people from play, efficiently search for their strongest cards, or have Commanders that tend to take away from more casual games." The Game Changers List dictates some elements of how strong a deck is, by giving guidance on how many should be played or which ones should be talked about
but Aquamoeba still offered a ton in seemingly every Madness build
If you want to complete it yourself, do not keep reading
The prevalence of Teferi in Modern means that most people do not run Veil of Summer as a 3 or 4-of anymore, which used to be the case about a year ago