While its effects can be powerful in the right circumstances, decks that rely heavily on traps and have ways to quickly fill the graveyard with Temple of the Kings and different traps would get the most value out of this card
Finishers/ Surprise /Alternate win conditions Tyrranax Rex is an amazing finisher
If they have a dead hand with no counters, you could possibly refill their hand with playable cards or even their win condition
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For an idea of the added value of this variant, a Ghost Stamp Error graded CGC 8 sold for $900 on eBay in May 2022, whereas a non-error example in the same grade is currently only worth around $25
When I was reading through the top 16 deck profiles, there was one deck that caught me slightly by surprise, and one I was pretty happy to see do so well