This strategy can be done with replacement units, 2nd Olivia for Azura and Legion for S!Tiki though you need the HP Seal equipped onto Legion (4 stars). The only difference is how the green cavalry unit would move at the end. Olivia should be able to tank one shot and retaliate good damage, in which case Ursula would finish off the Green Cav thanks to her tome being effective against Cavalry units.
Once again I’m open to helping anyone who is struggling, but this is as budget as I could get with what I had. Shout outs to this video in particular for my turn 1>turn 2 movement. Show him (or her) some love.