This is a little worse than Hellkite Tyrant's similar ability, which only requires 20 artifacts, but Knuckles also costs two less mana and is always available in your command zone
Brilliant work by Daniel Ljundgrren
The massive card flow that people want for free in Commander and multiplayer lead them to attack each other, but not you, especially since they don't have to spend a card to get the card draw, so for them, this is free card advantage over time for each foe that attacks each other, and you'll draw more than the card it took to cast him in one or two turns
A more than worthy opponent for Magic's powerful planeswalker protagonists, they've wreaked havoc across multiple planes throughout the game's story
While it can take a while to cast this, taking two turns should be more than enough to close the game