Draw a card for each Island you control
The first and most obvious place to start is by looking at the bottom corner of the card, typically on the right-hand side
With it, the player can force the opponent to devolve Evolved Pokmon by returning each of their highest Stage Evolution cards from the bench into the deck, which can result in Knock Outs depending on how many damage counters some creatures already have
Halo foils, especially mythics are in short supply, so this has a chance to show big gains
Sauron, Lord of the Rings's last ability will trigger even if the owner of the commander that died chooses to return it to the command zone after it dies
Beyond that, it combos well with all kinds of cards, giving players a wide range of options