Ferocious — If you control a creature with power 4 or greater, you may cast Dragon Grip as though it had flash. (You may cast it any time you could cast an instant.)
Enchanted creature gets +2/+0 and has first strike.
9/20/2014 If you’re using Dragon Grip’s ferocious ability to cast it as though it had flash, you must control a creature with power 4 or greater only as you begin the casting process and put Dragon Grip on the stack. Losing control of that creature while casting Dragon Grip (perhaps because you sacrificed it to activate a mana ability), or in response to Dragon Grip won’t affect Dragon Grip on the stack.
9/20/2014 You must cast Dragon Grip at the latest during the declare blockers step after blockers are declared if you want first strike to matter during that combat.