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Most of your other Royal Knights from BT13 also have effects that will trigger when they see a Royal Knight enter play so you can use Purge to play one of these Knights from under King Drasil, play another Royal Knight for the reduced cost, and get that extra effect

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Its an odd set of abilities looking through the eyes of modern Magic, but back in the day a 2/1 flier that you could protect was probably a real threat in the right deck

Seeing, or not seeing, the evolution symbol knocks out a bunch of choices