Ryze's new ult will be very good for pushing tier 2/3 towers
Step 1: Hit level 11 Step 2: Knock down an enemy tier 2 tower Step 3: Build up a large wave of your minions Step 4: Push up till you are close enough to where the lanes converge Step 5: Ult into another lane, bringing your own minions to the enemy tower.
This works especially well if you have taken an inhibitor.