Opal Guardian

[ssilver]

When opal guardian goes to the graveyard, is it a creature or an enchantment? Will it be grabbed by enduring renewal and returned to your hand?

[TrialByFire]

If it was animated when it dies, I'm pretty sure it goes to your hand. Akki?

[cdr]

It's checked based on what it was while it was in play.

Enduring Renewal 2WW
Enchantment
Play with your hand revealed.
If you would draw a card, reveal the top card of your library instead. If it's a creature card, put it into your graveyard. Otherwise, draw a card.
Whenever a creature is put into your graveyard from play, return it to your hand.

410.10d. Normally, objects that exist immediately after an event are checked to see if the event matched any trigger conditions. Continuous effects that exist at that time are used to determine what the trigger conditions are and what the objects involved in the event look like. However, some triggered abilities must be treated specially because the object with the ability may no longer be in play, may have moved to a hand or library, or may no longer be controlled by the appropriate player. The game has to "look back in time" to determine if these abilities trigger. Abilities that trigger specifically when an object leaves play, when an object is put into a hand or library, or when a player loses control of an object will trigger based on their existence, and the appearance of objects, prior to the event rather than afterward.

Example: Two creatures are in play along with an artifact that has the ability "Whenever a creature is put into a graveyard from play, you gain 1 life." Someone plays a spell that destroys all artifacts, creatures, and enchantments. The artifact's ability triggers twice, even though the artifact goes to its owner's graveyard at the same time as the creatures.