Cat Mentor

Defender
{x} equals the amount of cats you have on the battlefield. If you have no cats on the battlefield,
you may not play this card. Cat Mentor has mentor, but it can only be used on cats.
Whenever a cat attacks, Cat Mentor can then attack as if it didn’t have Defender.
Cat Mentor gains +1/+1 each turn it is in the battlefield.
If there are no cats on the battlefield, Cat Mentor
goes into your graveyard.