If you're talking about chaining sundials (reliably), you need--NEED--light mana. ESPECIALLY if you're playing upgraded versions. So if someone is willing to splash light for sundial chains, then if you want to beat it, you should respect it and splash fire for destroy.
As for sundials without hasten aka free damage prevention: easily beatable. Think about it. Instead of drawing answers, your opponent is drawing stall. This means he has that many fewer answers in his deck. The solution? Use your cards to deal with his answers, and not with his stall.
Ways to beat sundial:
Time: Eternity. His sundials will give out. In the meantime, you will never deck.
Earth: Earthquake his quanta, and his sundials will be that much more useless. If you're splashing gravity, pulverizer is GG.
Water: Go for the dome with ice lance.
Darkness: Pests/devos eat his quanta, drain life to the dome.
Fire: Fahrenheit, Fire Lance to the face, explosion.
Death: Deadly poison, if you splash water, physalia's ability.
Aether: Elite Phase Dragons. He can't do anything about them and once the sundial goes, it's over in short order.
Gravity: Splash Earth. Drop pulverizer. Win. Eat anything he drops with Otyughs.
Any other color: Build up your threats. Win after there's no more stall on the table.
