Opposition has bascially no power at all. Majority can pass any laws they want, but you have to realize because its a coalition not all parties have the same goal.
A simple yet example is the draft. Yesh Atid and Shas might be in the same co-alition. Yesh Atid is for the draft and Shas against.
It isnt as simple as you think, Parties in the ruling coalition have many things in common , but not everything