Tribal Assault

As Tribal Assault enters the battlefield, choose a creature type.
At the beginning of your upkeep, put a training
counter on Tribal Assault, then you may search
your library for a creature card equal or less than
the amount of training counters on this card
with the chosen creature type. Put that card onto
the battlefield and shuffle your library.
When a creature with the chosen creature type
enters the battlefield or attacks, draw a card.