"The pitch will play different in the second innings, a bit of spin, give freedom to our players."
Scotland's Saltires, who have won both of their matches so far, brought back Safyaan Sharif for Alisdair Evans.
"We would have been happy either way. Comfortable chasing," said captain Kyle Coetzer.
"We've got a real belief and togetherness among our group, having to win three games to top the group, if that's what we have to do, we are comfortable with that."
Victory for the winner will see them join Bangladesh, who earlier beat Papua New Guinea by 84 runs, in the Super 12s.
Sri Lanka qualified on Wednesday from Group A with either Ireland or Namibia set to join them on Friday.
Oman: Jatinder Singh, Aqib Ilyas, Khawar Ali, Zeeshan Maqsood (capt), Naseem Khushi, Kashyap Prajapathi, Mohammad Nadeem, Suraj Kumar (wk), Sandeep Goud, Fayyaz Butt, Bilal Khan
Scotland: George Munsey, Kyle Coetzer (capt), Matthew Cross (wk), Richie Berrington, Calum MacLeod, Michael Leask, Chris Greaves, Mark Watt, Josh Davey, Bradley Wheal