It says 'Counter Target Spell'.
And also 'Kill target Ramosian Sergeant/Meddling Mage'
And it also says something else, but I can`t remember what and I don`t care.
I used Flametongue Kavu three times in a single game, with a Recover and a Darigaaz's Charm. So I'm partial to it. It also helped to have the Lava Zombie available to bounce it back to my hand.