Hero card

Form a Posse

Sorcery

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

Needs: Valiant, Tokens

Gives: Tokens, Spells

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

Build a deck with Form a Posse as the hero

Makes it work

Dog Walker · Dragon Fodder · Goblin Negotiation · Release the Dogs · Hop to It · Cloudspire Coordinator · Heroic Reinforcements · Frontline Rush

Benefits from it

Pollen-Shield Hare · Starry-Eyed Skyrider · Bria, Riptide Rogue · Crash Through · Surrak, the Hunt Caller

Use instead if you don't have it

Goblin Negotiation · Choco-Comet · Hop to It · Doppelgang · Dragon Fodder · Release the Dogs

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)