Islands cease to produce extra mana, since the effect of High Tide ends, and the delayed triggered ability no longer exists
It gets them thinking 'Ah, this must be that dungeon in the game ' It's simply wonderful." A fair number of cards from the Final Fantasy set also recycled some of Nomuras previous art work for the video games
These extra mechanics, while having the potential to produce great flashes of synergy, do ever so slightly muddy the waters around what exactly the decks winstate is supposed to be
As far as asthetics, Legion is unparalleled in the Magic sleeve world
Also, due to the 3rd effect of [Herald of the Arc Light] and the 2nd effect of [Chaofeng, Phantom of the Yang Zing], you can search for follow-up cards like [Illusion of Chaos], [Diviner of the Herald], or various hand traps when they are sent to the Graveyard, so even if this board is broken, you can perform additional plays on the return turn