Megamorph makes your creature slightly larger upon unmorphing, but the name and the uninspired bonus text left megamorph as one of the most disliked Magic mechanics of all time, to the point where designers have stated they'll likely never use the mechanic again
The Cloudsea Djinn / Nyxbloom Ancient $25 Nyxbloom Ancient emerged from Theros Beyond Death as one of the best mana doublers and best ramp cards in the game
In short: the goal is to not be the archenemy at the table and instead work with the other players to take out other threats -- all while you're setting up to snag victory once your opponents have wasted their resources
Finally, Cloud also has the capacity to generate Treasure tokens, helping to offset the cost of casting/attaching more equipment
From commander choice and deckbuilding, to politics and card synergy, my strategy articles cover all the Commander format essentials and more
While it's far from the most playable card, it's not a bad land necessarily