The only reason she isn't the most expensive is that there are Iconic cards in the set
Importantly, the goal isnt to tear down your opponent (in Magic you normally started with 20 life the similarities are strong) but instead to race towards story enlightenment
You can see the decks' MTG commanders below, but first here's an overview: Terra, Herald of Hope leads the graveyard deck Revival Trance that can quickly assemble a large horde of low-power creatures, perhaps for some aristocrats shenanigans
The benefits of shaving your opponents life down are twofold as this also triggers proliferation meaning you get to double any existing counters on your creatures
The Floodborn card is one of the Amber Lorcana cards in The First Chapter that helps players to find what they need from their deck, with the option to exert characters costing two ink or less to draw cards from your deck
Did you know this was going to be a counter deck already or did counters come from exploring Blitzball as a concept