It is cheap, inkable, and when she quests she has the benefit of making a Princess or Queen card cost one less when played that turn
Most cards that are able to ready a character are restricted from questing multiple times, but Beast is free to quest as many times as you can trigger his ability, making him a dangerous card that can end the game by scoring four or six Lore in a flash
Last years Commander product included a deck built heavily around enchantments, and it was awesome to be able to add Hall of Heliods Generosity to the deck
The problem with "StP" comes from its casting cost: for a single mana, you get to kill virtually any creature in the game
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There are far far better ways to kill artifacts available in red than Rakdos Charm however they mostly just kill artifacts and are therefore too risky to be played