You also have sources that double damage to make the burn hurt that much more such as Twinflame Tyrant, City on Fire, Fiery Emancipation, and Gratuitous Violence
Doubling your wizards ETB triggers is already great with cards like Cloudkin Seer and Archaeomancer, but it also doubles the triggers on cards like Door of Destinies
There are a few decks that actual turn this rule into an exploitable advantage, using it as a free discard outlet to pitch giant creature cards to Reanimate next turn or a Dredge card such as Golgari Grave-Troll for subsequent self-milling, but in what I would call fair decks, this maximum hand size rule is not nice, especially when you are mana-screwed
Proxying in Commander Proxying for formats like Commander is what has given rise to the debate about proxies, more than any other format
The treated surface is wear - and scratch - resistant with good anti - slip properties, keeping cards stable