How does totem armor work with Planeswalkers?

Totem armor won't do anything to stop a planeswalker from losing loyalty to damage and then going to the graveyard for having no loyalty, as that's not destroying the planeswalker. What having totem armor will do is protect the planeswalker from direct destruction effects such as Dreadbore or Vindicate.

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Accordingly, how do auras work mtg?

Auras have many uses on many types, bestowing continuous effects, setting up triggers, or bringing their own activated abilities. Some Auras, like Pacifism, can be considered removal spells in disguise. Other Auras enhance the creature they're enchanting. Can Mirage Mirror Target graveyard? The moment Mirage Mirror hits the graveyard it stops being a copy of whatever you copied, but "dies" triggers use the last-known-information from the battlefield to determine if and how they trigger.

Accordingly, can mirage mirror copy graveyard?

Mirage Mirror will wind up as a copy of the permanent targeted by the last ability to resolve. If Mirage Mirror becomes a copy of an Aura, it's put into its owner's graveyard unless it's somehow attached to an appropriate object or player already. Can Mirage Mirror target itself? For example, if Mirage Mirror is activated twice in response to itself targeting first Rampaging Hippo then Frilled Sandwalla, the ability it has while it's a copy of Frilled Sandwalla can be activated and its effect will continue to apply while Mirage Mirror is a copy of Rampaging Hippo. Mirage Mirror. 0.02 0.00 Non-foil Foil

Does becoming a copy trigger ETB?

You are correct that a clone copying a creature with an ETB like shriekmaw will trigger the ETB. Clone and its freinds go seemless from a clone spell on the stack to copy of whatever you chose to copy as it resolves and enters the battlefield so the game sees the chosen creature ETB. Do copies trigger ETB? If i clone a creature with a spell such as the recently revealed [[altered ego]], if the cloned creature has any ETB triggers, will they trigger? Yes etb triggers happen, as it enters the battlefield as the creature. Thanks! Clone doesn't target, you choose the creature it is copying, as it resolves.