Hunt the Weak [Fate Reforged] SPA Roc de la torre how would I know it

how would I know it worked

" —Alcarus

Set: Dragons of Tarkir Type: Creature — Human Berserker Uncommon Cost: {2}{R} Trample Kolaghan Forerunners's power is equal to the number of creatures you control

Set: Commander 2018 Type: Sorcery Uncommon Cost: {3}{G} Search your library for up to two basic land cards

Set: Homelands Type: Creature — Bat Rarity: Common Cost: {1}{B}{B} Flying

Hunt the Weak [Fate Reforged] SPA Roc de la torre how would I know itSet: Fate Reforged Type: Sorcery Common Cost: {3}{G} Put a +1 +1 counter on target creature you control. Then that creature fights target creature you don't control. (Each deals damage equal to its power to the other.) Dragons scorn the weak, even among their own kind.