Golden Guardian // Gold-Forge Garrison

If the target of Golden Guardian's activated ability isn't a legal target as that ability resolves, or if Golden Guardian has left the battlefield, neither creature will deal or be dealt damage.

Wotc — January 19, 2018

Once Golden Guardian's activated ability has resolved, it will return to the battlefield transformed if it dies for any reason in that turn.

Wotc — January 19, 2018

If Golden Guardian leaves the battlefield before its activated ability has resolved, it won't be returned to the battlefield when the ability resolves.

Wotc — January 19, 2018