Fervor
Enchantment
Creatures you control have haste. (They can attack and 
as soon as they come under your control.)
"If your blood doesn't run hot, I will make it run in the sands!" —Maraxus of Keld
Franz Vohwinkel
Weatherlight (WTH)
• #99Rulings
If an attacking creature loses haste, perhaps because Fervor leaves the battlefield after attackers have been declared, it won’t be removed from combat.
(wotc • 2012-07-01)
Rulings
If an attacking creature loses haste, perhaps because Fervor leaves the battlefield after attackers have been declared, it won’t be removed from combat.
(wotc • 2012-07-01)