Tyrion, Defender of Uthwan

Indestructible, Vigilance, and Lifelink.
{2}{w}{t}: Create a 2/2 white Silver Helm Elf Knight creature token with vigilance.
When Tyrion attacks he receives +1/+0 until end of turn for each Silver Helm attacking with him.
{6}{t}, Sacrifice six Silver Helm's: Transform Tyrion, Defender of Uthwan. Then untap it.