CardName: Tamiyo's Charm
Cost: {3}{U}
Type: Instant
Pow/Tgh: /
Rules Text: Choose 1
• Tap target creature. It doesn't untap during its
controller's next untap step.
• Return target instant or sorcery from your graveyard to
your hand.
• Target player shuffles their graveyard into their library.
Flavour Text:
Set/Rarity: Multiverse Design Challenge None
Tamiyo's Charm
Instant
Choose 1
• Tap target creature. It doesn't untap during its controller's next untap step.
• Return target instant or sorcery from your graveyard to your hand.
• Target player shuffles their graveyard into their library.
See Challenge # 144. Call to Mind costs and reminds me of Tamiyo. I felt Tamiyo, the Moon Sage's +1 needed to appear on her charm since it's a common effect and a clear way to represent her. Reminisce also costs and seemed like a potentially neat concept (I don't know if Reminisce is ever used because the cards being returned to the deck won't be useful later and possibly reduce the opponent drawing what they need).
See Challenge # 144. Call to Mind costs
and reminds me of Tamiyo. I felt Tamiyo, the Moon Sage's +1 needed to appear on her charm since it's a common effect and a clear way to represent her. Reminisce also costs 
and seemed like a potentially neat concept (I don't know if Reminisce is ever used because the cards being returned to the deck won't be useful later and possibly reduce the opponent drawing what they need).
Reminisce is blue's way to do graveyard hate. The most powerful mode here is Call to Mind, I think, especially at instant speed.