To be honest, it is good. However, the last skill should be something that can heal you. I personally recommend:
Rend Heaven
Luna / Dragon Fang
Hoshidian Unity
Replicate
Renewal
If Corrin gets KOed in Casual or Classic, it will be game over no matter the difficulty. As such, having Renewal will ensure that you will be at full health at the start of your turn.
It does take time to get going, but the end result will be worth the trouble.