Bostoz, the arrowimmortal.

Vigilance, convoke, trample, haste,
Bostoz, the arrowimmortal can not be blocked.
If Bostoz, the arrowimmortal would die,
exile it instead. Than return it to the
battlefield under it owners control. It gains haste.
{g}: add {g}{g}{g} to your mana pool.
{g}{g}: create three 1/1 green elf warrior
creature tokens.