In the case of Elsa, Spirit of Winter, it helps that the card itself is also one of The First Chapters stronger picks, offering the power to freeze your opponents characters to stop them challenging your cards or questing for lore
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You place your Pokemon on a grid and they automatically battle the enemy team - the strategy is in building your team and placing your creatures
In other words, if you don't discard a land, it is put into the graveyard without entering the battlefield
The flavour is similar to some Black spells, but I guess if it's transforming instead of doing a ritualistic sacrifice to Griselbrand the Arch-Devil, it's totally about life and nature