Callisto, Field-Gazer

Spells in players' hands have Assist.
(Another player can pay up to X of that spell's cost, where X is the total generic mana cost.)

Offer a Paw —Whenever a player Assists a spell, you and that player create a tapped treasure token.

Rest a While —Whenever you Assist a spell, the Assisted player cannot attack you until the beginning of your next turn. Draw a card.