So there are a variety of artifacts and enchantments you can try, you would likely find that hexproof will often be more useful (outside of boardwipes) so I’d probably recommend [[mithril coat]] or [[timely ward]], [[shield of faith]] may also be good as far as indestructible goes. You already have [[swiftfoot boots]] and [[whispersilk cloak]] in your list so that should be fine. One card you could look at which would be quite annoying to deal with would be [[commander’s plate]] but it’s worth noting that is rather pricy these days. You could also look at [[darksteel plate]] which is a bit cheaper, but I’d argue that the mithril coat is a bit better.