Pantheon, the Warrior

When Pantheon attacks, Pantheon gains first strike until end of turn if a creature you control has first strike. The same is true for flying, deathtouch, double strike, haste, hexproof, indestructible, lifelink, menace, reach, skulk, trample, and vigilance. Then, gain an experience counter. At the beginning of the next end step, if you have three or more experience counters, transform Pantheon.
Pantheon gains +1/1 for each experience counter you have.