Nivina Scion

Flying, Haste.
Firstblood 1 (When this creature deals combat
damage to a player, if it was the first to do so this
game, put a +1/+1 counter on it.)
For as long as Nivina Scion has a +1/+1 counter,
it and other creatures you control have menace.
"The skies were terrifying that night, but it wasn't the
birds that made it that way..."