2019-08-19, 08:01 AM (ISO 8601)
Bugbear in the Playground
Re: MTG Share your Card Designs II
No, you don't, because you're not checking for lethal damage as an SBA until after the creature has already lost indestructible as part of its static ability. It remains indestructible as long as it doesn't have lethal damage marked on it [CR 604.1, 611.3a], then the static ability says "Hey, you! You're not indestructible any more!" Then, once it no longer has indestructible, the SBA checks next time a player would gain priority. It's the same way that trample checks for lethal damage on indestructible creatures.
Originally Posted by Silfir
Checking the rules and the one relevant example more carefully, another way of wording it is "~ can't be destroyed by effects (It can only be destroyed by lethal damage or deathtouch damage)" or "~ can only be destroyed by damage." These are probably more succinct anyway.