Corgatron 2000, Goodest Boy

Whenever Corgatron 2000 enters the battlefield
or attacks, you may physically pet this card.
When you do, put a Happiness counter on it.
At the beginning of your upkeep you may bark
like a dog. If you do, put an Excitement counter
on Corgatron 2000.
Corgatron 2000's power is equal to the number
of Happiness counters on it to the power of the
number of Excitement counters on it.