Vanguard of the Legion

As an additional cost to cast Vanguard of the Legion, discard a card or pay {2}.

Flying, lifelink, legion (For each creature with legion,
creatures you control that share a type with a legion
gain another legion level:
I. Creatures of this type cost you {1} less to cast.
II. Creatures of this type you control have +1/+1.
III. Whenever a creature of this type enters the battlefield under your control, draw a card.)