Time Twister effects used to be more popular but their high cost and high risk due to giving away up to seven new cards has seen them significantly decline in all bar the combo decks
Thus, by Level Four, your Ring-bearer becomes a formidable Creature that is both painful to block and painful to allow through
While Cinderella works especially well in decks that focus more heavily on princess characters, she also does let you trigger her effect by just playing her, making her a solid draw/ink engine in-and-of-herself
Opt Cantrips are said to replace themselves, in the sense that when they leave your hand, you draw another card to replace them
However, if you want to play them for yourself, the Starter Kit is currently sold out on Amazon, so your best bet to find one is to hit up your local card shop (known in the community as your LCS) to see if it has any in stock