An interesting example of a card that I liked in the 540-card build as compared to 360 is Mox Opal
It costs five, impending four turns for three mana
Chaos: Whenever you roll Chaos, Carac Agaialor deals damage to each player equal to the number of creatures they control
While we already have Castle Ardenvale to make tokens from our lands, adding in a Khalni Garden or (if have the budget room) Kjeldoran Outpost gives us even more outlets for our excess mana and slowly grow our armies in a way thats tricky to interact with
Each land here represents a different location in the Forgotten Realms, namely Waterdeep on plains, the Moonshae Isles on islands, the Underdark on swamps, Neverwinter on mountains, and the jungles of Chult on forests
It was first released in 1999 by Wizards of the Coast