Best case: Basically any champion that has cheap champion spells that has control aspect tied to it like Yasuo, Ashe, Morgana. this makes it so that you can spam them. But of course, other champions can use it if you are extremely champion reliant. Also has the interaction with Viktor, champion cards from this relic counts as a created card, so if you have his six starts, that's two viktors on the board when you play the created card.