Valkyrie, Grand Chariottes

Flying, Vigilance, Menace, Banding
This spell can't be countered.
This creature gets +1/+1 for each attacking
creature.
This creature can't have -1/-1 counters placed
on it.
When Valkyrie, Grand Chariottes attacks she
gains "While this creature is tapped,
permanents you control in a band gain
shroud."
{t}, {x}: X target creatures gain +0/+3