Budget cards similar to Spirit Barrier?

Hi everyone! Recently I've been working on a reptillianne deck for casual play. On YGOPRO I've been using Spirit Barrier to prevent battle damage while using Reptillianne Naga to reduce the monster she battles' ATK to 0. As she can't be destroyed by battle, I think it's a pretty cool little system.

The only issue is that now when I look to buy the cards for real, individual copies of Spirit Barrier are about £5 each which is a bit out of my range right now. Are there any cheaper cards that do effectively the same thing? IE prevent battle damage long term?

(Also I apologise if this is not the place to ask, I'm new to this sub reddit)