Thundering Raiju, which dishes out +1/+1 counters as well as damage
He's expensive for what he does, and the limitation of only being able to use the mana for artifacts makes little sense in a game where we have Sol Ring, Mana Crypt, Thran's Dynamo, Worn Powerstone, Sissay's Ring, or basically any other colourless mana rock
So similar that we can actually discuss them simultaneously: If an effect would create one or more tokens under your control, it creates twice that many of those tokens instead
Nissa, Ascended Animist Nissa is an incredibly powerful planeswalker, even the desparked form Nissa, Resurgent Animist
At its most fundamental level, Commander is a format that prides itself on being social
The lower mana cost comes with a worse toughness, but this doesnt matter as much since youll probably attack more than you block with it