This card's not particularly useful, but the main reason it's expensive is the nostalgic factor that comes from nearly every Pegasus card
It doesn't have to attack the same player, planeswalker, or battle as your legendary creatures
It likely goes well in a hybrid mill/attack/skies strategy, as Jaces Phantasm and Wight of Precinct Six suggest is viable
Inside, you'll find three Pokmon TCG booster packs filled with thrilling cards and surprises, along with two Pokmon sticker sheets to personalize your collection
[When Attacking] [Once Per Turn] For every 10 total cards in both players' trashes, trash the top card of your opponent's security stack
Whats more is that theres no limit to how many times you can activate this effect per turn