Hero card

Tidecaller Mentor

Creature – Rat Wizard

Value on arrivalDoes its thing as it enters: worth it from the first moment

Needs: Graveyard

Gives: ETB

Not in winning lists yet: read from the card text and the graph

Build a deck with Tidecaller Mentor as the hero

Makes it work

Cephalid Inkmage · Mindwhisker · Emet-Selch, Unsundered · Likeness Looter · Kitsa, Otterball Elite · Theorix Metamage · Souls of the Lost · Dreadwing Scavenger

Use instead if you don't have it

Merfolk Cave-Diver · Ulna Alley Shopkeep · Private Eye · Breeches, the Blastmaker · Don & Raph, Hard Science · The Infamous Cruelclaw

Cards in the meta that answer it

Countersculpt (Azorius Control) · Get Lost (Azorius Control) · Jeskai Revelation (4-Color Control) · Inevitable Defeat (4-Color Control)