Hero card

Quarrel

Instant

SpellUsed once: what it does depends on when you cast it

Needs: Valiant

Gives: Spells

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

Build a deck with Quarrel as the hero

Makes it work

Emberheart Challenger · Nettle Guard · Veteran Guardmouse · Whiskervale Forerunner · Whiskerquill Scribe · Mouse Trapper · Seedglaive Mentor · Flowerfoot Swordmaster

Benefits from it

Primeval Bounty

Use instead if you don't have it

Lumaret's Favor · Close Encounter · Rocky Rebuke · Bite Down · Tenderize · Burrog Barrage

Cards in the meta that answer it

Countersculpt (Azorius Control) · Inevitable Defeat (4-Color Control) · No More Lies (Azorius Control) · We Say Thee Nay! (Dimir Aggro)