Used a similar deck once, a build I got off the forum/wiki, Otyughs eat stuff, and your chargers are your offense, but the problem I had was dmg output, games were slow until I could build up my otyughs or draw a charger, but I had 5 of each, not 3 of each. I also didn't have gravity shields, they are nice, yes, but against a fire deck with crimson dragons, they would get through the shields, and sure, you could heavy armor the dragons so they have higher than 5 hp, but then they just deflag your shield.
Great intentions, but its greatly vulnerable to mono fire, mono dark?