Since each Shrine is legendary, it's impossible to have multiples of one on the battlefield at once, making them incredibly hard to build around in 60 card competitive formats like M:TG Standard
Enduring Curiosity | Illustration by D-Suzuki Japan Showcase cards are a Booster Fun initiative that started with Duskmourn: House of Horror and thats continues for most new Standard releases
This is part of why Wraths still see just as much play as they used to despite clearly being less effective
This might give you pause for thought before including in a 60-card Constructed deck, though even then, if you're running an anthem, you should probably swap at least one of them out for this card ASAP
Legacy decks cost a few thousand US dollars while Vintage can reach five-digit deck prices
And like Chaos Warp, Beast Within might be used on the caster's own cards in a pinch, especially if they only need a mere 3/3 Beast to attack back and win the game