If Combat Celebrant hasn't been exerted this turn, you may exert it as it attacks. When you do, untap all other creatures you control and after this phase, there is an additional combat phase. (An exerted creature won't untap during your next untap step.)
“This is the hour when we draw swords together!”
—Aragorn
Near Mint - $0.80
Lightly Played - $0.60
Moderately Played - $0.50
Heavily Played - $0.50
Damaged - $0.40
Near Mint Spanish - $0.80
Lightly Played Spanish - $0.60
Moderately Played Spanish - $0.50
Heavily Played Spanish - $0.50
Damaged Spanish - $0.40