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This card's not particularly useful, but the main reason it's expensive is the nostalgic factor that comes from nearly every Pegasus card

Not background necessarily, but some other line of text that says something along the lines of Whenever you sacrifice a Treasure token, give a creature a +1/+1 counter and trample until end of turn. That would make it a lot more interesting and powerful, but I suppose not every card needs to be great

[When Attacking] [Once Per Turn] For every 10 total cards in both players' trashes, trash the top card of your opponent's security stack

It likely goes well in a hybrid mill/attack/skies strategy, as Jaces Phantasm and Wight of Precinct Six suggest is viable