So, if your water-type deck features two Psyduck and you want Battle Flair for both, you would need to buy two
If you have a Sundial of the Infinite on the battlefield, you can cast Glorious End whenever you want and then go about your turn as normal as long as you end your turn before going to your end-of-turn phase
Toss in a few cards that care about tokens or ETBS like Parallel Lives and Panharmonicon and youre on your way to Victory Road
Fraying Sanity's triggered ability counts the number of cards that were put into the enchanted player's graveyard during the turn, even if Fraying Sanity wasn't on the battlefield at the time those cards were put there, and even if those cards have left that graveyard
However, relics of the game's history, like this promo featuring one of the goofiest depictions of Lucario to date
For the Legacy players amongst us, the Lands deck uses Dark Depths as the win condition