Zerg Flyer Attacks

Zerg Flyer Units gain +1 Damage.
{p/u}{p/u}{p/g}{p/g}: You can play a second copy of this
card once you have a Tier 2 Base .
{p/u}{p/u}{p/u}{p/g}{p/g}{p/g}You can play a third copy of this
card once you have a Tier 3 Base