Owlet Duelist

{u}: Owlet Duelist becomes a Bird Solider with base power and toughness 2/2.
{u}{u}{u}: If Owlet Duelist is a Soldier, it becomes a Bird Warrior with base power and toughness 4/4.
{u}{u}{u}{u}{u}: If Owlet Duelist is a Warrior, it becomes a Bird Knight with base power and toughness 6/6 and gains flying, flanking, provoke, and prowess.