Shellfish Scholar

Creature — Rat Wizard2/2

Whenever Shellfish Scholar or another Rat you control enters, conjure a card named Think Twice into your graveyard. Threshold — {T}: Spells you cast from your graveyard this turn cost {2} less to cast. Activate only if seven or more cards are in your graveyard.

Not legal in Commander

View Shellfish Scholar on Scryfall