Kevin, Plastic Swordsman

{t}Add {g}, Spend this mana only on creature abilities.
{g/u}{x}: Creatures you control gain +X/0 and gain Trample.
{x}{g/u}{g/u}, Search your library for a creature card
equal or less than CMC X and put it onto the battlefield. It gains Haste until the end of turn.
If X was 4 or more the creature gains the ability "{t}Add {g}, Spend this mana only
on creature abilities.", then draw a card.