This is completely fine since the value it threatens more than compensates for this, but dont accidentally apply your Rat buffs to this card
There isnt enough token generation to go wide and swamp the board for a decisive win and the deck is vulnerable to board wipes which it struggles to come back from
When Planeswalkers were released, in Lorwyn, Wizards needed to dedicate themselves, over the course of sets, to creating efficient answers for them in addition to counterspells
If you control no tapped artifacts when the triggered ability resolves (perhaps because they were destroyed or had vigilance), no damage will be dealt and you won't scry
Ethan solidified the theme of the deck by aligning all the mills to mill 3, and he's a generically "good" commander
As for his activated abilities, it'll be interesting to see how the card plays out