If a redirection effect causes a Spelling Bee you control to deal combat damage to you, you'll look at the top card of your own library and will choose a word to spell
For example, even if we interpreted your library as part of the battlefield for this purpose, slipping one into the card sleeve of a card in your library during a search effectively marks your deck, and that's not allowed
Ranar the Ever-Watchful fills the board with tokens, and Syr Vondam, Sunstar Exemplar grows larger and eventually becomes a removal spell itself
However, it can be one of the strongest cards in the game in the right decks and under some circumstances, as it has the What A Mess ability that reads "During your turn, you may banish chosen Item of yours to play this character for free." Belle's ability is fantastic for Sapphire Lorcana decks because a lot of them run at least some Items, especially the 1-cost Pawpsicle in four copies
Lowering your own creatures' toughness may sound counterintuitive, but it's an incredible way to set off those death triggers and draw lots and lots of cards
Sorceries, instants, enchantments, creatures - it doesn't matter