This is a two-player game for ages 8+
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The least popular of these may be Realm of Koh, but it makes nearly unblockable spirits which matter a ton from a set known for cluttering the board with lots of creatures and tokens
I think the trade-off for rarity came at the casting cost
You can cast it for 0 mana by paying 2 life, and it strips not just one card but every copy of it from the graveyard, hand, and library
The Raid Boss Pokmons attack costs are all considered Colorless, meaning any Energy (Basic or Special Energy) can be used to pay the attack cost