Gaelus Planeborn

Planeswalker spells cost {1} less to cast.
Whenever a player casts a planeswalker spell, put
a knowledge counter on Gaelus Planeborn. Then, if there are two or more knowledge counters on him, transform him.
{x}{w}{g}: Search your library for a planeswalker card with converted mana cost X, reveal it, put it into your hand, then shuffle your library.