In a cEDH deck, for instance, thats packed with all the 0 and 1 cost Artifact accelerants, Mox Opal may be the most synergistic of the bunch but it requires deck building synergy to reach its potential (unlike the Moxen I selected which are kind of just versatile on their own and dont require any build around)
The quicker and more proactive you are the less you will have to worry about things as you will just kill people before they can draw and play the real problem cards
Centering is the most common killer, both left-right and top-bottom
If mill doesnt work, you can possibly take someone out via commander damage
Its only attack, Giga Burn, for PPC does a massive 120 damage
When new cards drop or the meta starts adapting, a deck that felt smooth and unstoppable last week can suddenly feel a bit clunky or get pushed aside by something faster and more consistent