While we can argue about whether Signets themselves are simply too good for Standard, I think most people would agree that if they aren't too good, they are, at the very least, right on the border
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This isnt the best Frenzy deck in the world, but its still strong and will take over the game when people load up on creature removal spells and get blindsided by it
Add Pidgeot ex for consistency and Tyranitar ex for raw damage, and youve got a toolbox deck in the making
Another cracking white card is Dawns Truce, the White Heroic Intervention
Once all of the time counters are removed, it reveals itself as the horrifying creature you always knew it could be