We have xantid swarm in our sideboard here due to abrupt decay or at least I pack 4 copies currently. Sure we don't have silence but 5 color is stupid with a fetch dual manabase w/out city of brass and gemstone mine. Also, let's say they force our chain of vapor on their leyline. What exactly stops us from going off the next turn with ad nauseam and/or PiF to draw into another chain of vapor, bounce it, then tendrils them out? If they have double counter backup as well as leyline their hand is going to get wrecked in the process giving us time to rebuild to go off again.

The odds of them having leyline + FoW is very low. They can't always have it at all unless you're just getting lucksacked out, and we've all been there before.

Diminishing returns has almost no advantages over time spiral in a wishboard in ANT. We will generally have 2+ lands out by the time we cast returns as we are not casting it turn 1. Exiling 10 cards is pretty bad as well as not running chrome mox to facilitate us going off post dreturns with more consistency. And when time spiral has 3 lands in play it becomes timetwister that exiles itself as well as floating 3 of different colors essentially, which is pretty damn good.

The only reason this deck is called ANT is because that's what people started calling it several years ago when ad nauseam was first introduced into the deck and people saw how good it was. It isn't the name that matters. People know what you're talking about when you say ANT. If you say flaming vault they raise eyebrows. Storm in flames would do the same. Ideally the deck would be named after some cereal like combo decks of old (golden grahamans, fruity pebbles, trix, etc. etc.) but unfortunately that isn't happening.