Unfortunately, your combo is too slow. 6 mana Artifact and 4 mana Enchantment takes too much time to put out. Remember that Modern is kind of a Turn-4 format, which means the games usually
ends by turn 4 or there would be someone with a clear advantage.
Rule of Law is not exactly a bad card. Yes it slows down your game, but that is the whole point.
When playing
Rule of Law, there are two ways to break the card:
1) You can play one spell during your turn AND during opponent's turn, which means casting a
counterspell on opponent's turn
2) Just because you can only play one spell per turn, you can still activate numerous abilities. I'm thinking
Gideon, Ally of Zendikar for tokens every turn
The approach you want to take is to cast a spell on your turn and then cast a
counterspell on opponent's turn. Stall until you find your lock in
Kira, Great Glass-Spinner, Ghost-Lit Wanderer and
Soratami Savant.
In terms of counters and answers,
Path to Exile,
Spell Pierce,
Negate are all great. If you run enough of these spells, consider playing
Delver of Secrets, there is a high chance that you would be able to flip that into a 3/2 flyer as an alternative win con.