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700.4. If a permanent is indestructible, rules and effects can’t destroy it. (See rule 701.6, “Destroy.”)
Such permanents are not destroyed by lethal damage, and they ignore the lethal-damage state-based
action (see rule 704.5g). Rules or effects may cause an indestructible permanent to be sacrificed, put
into a graveyard, or exiled.
700.4a Although the text “[This permanent] is indestructible” is an ability, actually being
indestructible is neither an ability nor a characteristic. It’s just something that’s true about a
permanent

704.5g If a creature has toughness greater than 0, and the total damage marked on it is greater than
or equal to its toughness, that creature has been dealt lethal damage and is destroyed.
Regeneration can replace this event.

701.6. Destroy
701.6a To destroy a permanent, move it from the battlefield to its owner’s graveyard.
701.6b The only ways a permanent can be destroyed are as a result of an effect that uses the word
“destroy” or as a result of the state-based actions that check for lethal damage (see rule 704.5g)
or damage from a source with deathtouch (see rule 704.5h). If a permanent is put into its
owner’s graveyard for any other reason, it hasn’t been “destroyed.”
701.6c A regeneration effect replaces a destruction event. See rule 701.11, “Regenerate.”

Saint schreef:

700.4. If a permanent is indestructible, rules and effects can’t destroy it. (See rule 701.6, “Destroy.”)
Such permanents are not destroyed by lethal damage, and they ignore the lethal-damage state-based
action (see rule 704.5g). Rules or effects may cause an indestructible permanent to be sacrificed, put
into a graveyard, or exiled.