Boros Challenger [Guilds of Ravnica] Human Merfolk Set: Khans of Tarkir Type:

Set: Khans of Tarkir Type: Creature — Dog Scout Rarity: Common Cost: {5}{R} First strike

where X is 3 plus the number of cards named Muscle Burst in all graveyards

except "Spellbook of Knowledge"

except "Chaos Betrayer"

Set: Invasion Type: Creature — Kavu Rarity: Uncommon Cost: {2}{R}{G} Yavimaya Kavu's power is equal to the number of red creatures on the battlefield

Boros Challenger [Guilds of Ravnica] Human Merfolk Set: Khans of Tarkir Type:Set: Guilds of Ravnica Type: Creature Human Soldier Rarity: Uncommon Cost: {R}{W} Mentor (Whenever this creature attacks, put a +1 +1 counter on target attacking creature with lesser power.) {2}{R}{W}: Boros Challenger gets +1 +1 until end of turn. "Send your champion. I could use a light workout."