Valphiriel, Dragon of Silver

Flying, Ward {4}
Whenever Valphiriel, Dragon of Silver attacks,
all other attacking Elf creatures gain +2/+1, and Valphiriel, Dragon of Silver gains +2/+1 for each attacking Elf creature.
"I reveal myself to you now not to strike fear,
but to inspire. Rise up against this tyranny!" —Valphiriel