Rings of Brighthearth Tawnos Coffin

[BruiZar]

Oracle Text: You may choose not to untap Tawnos's Coffin during your untap step.
3, Tap: Exile target creature and all Auras attached to it. Note the number and kind of counters that were on that creature. When Tawnos's Coffin leaves the battlefield or becomes untapped, return the exiled card to the battlefield under its owner's control tapped with the noted number and kind of counters on it, and if you do, return the exiled Aura cards to the battlefield under their owner's control attached to that permanent.


Oracle Text: Whenever you activate an ability, if it isn't a mana ability, you may pay 2. If you do, copy that ability. You may choose new targets for the copy.

If I copy the coffin effect, this is the only part that is copied right?
Exile target creature and all Auras attached to it.

If so, can I do this?:
Exile Tarmogoyf with Tawnos Coffin
Copy Tawnos Coffin
Target Tarmogoyf again

Which would cause this to happen:
Rings of Brightheart copy resolves first
Tarmogoyf is exiled
Tawnos Coffin resolves, but has no legal target
Tarmogoyf never returns

[meadbert]

The whole paragraph is the ability.  You still have to note the number and kind of counters etc and if coffin is ever untapped or leaves the battlefield Goyf still comes back.

EDIT:  Another way to do a 2 for 1 would be Voltaic Key since you could activate and then inresponse untap and activate again.  That way you exile 2 creatures and just keep coffin tapped.

[BruiZar]

Part 1
But the Rings of Brighthearth copy is independent from the Tawnoss´ Coffin effect right? Why should the creature that was exiled with the Brighthearth copy come back when Tawnos´ Coffin is untapped? It´s Rings of Brighthearth that did it and Rings of Brighthearth never untaps? As I understand it I can use Tawnoss' Coffin to exile a Tarmogoyf, copy the effect with Rings targeting a Knight of the Reliquary. Now, when I untap my Tawnoss' Coffin, the Tarmogoyf returns but the Knight is gone permanently.



Part 2
With Voltaic Key you would simply untap the Coffin and the creature would return due to this clause "When Tawnos's Coffin leaves the battlefield or becomes untapped blablabla"

I see what you're saying and I think you're right about this.

[Clariax]

3,  : Exile target creature and all Auras attached to it. Note the number and kind of counters that were on that creature. When Tawnos's Coffin leaves the battlefield or becomes untapped, return the exiled card to the battlefield under its owner's control tapped with the noted number and kind of counters on it, and if you do, return the exiled Aura cards to the battlefield under their owner's control attached to that permanent.

This is the ability of Tawnos's Coffin that the Rings copies.  The entire ability is copied, including the part that sets up the delayed trigger.  And both the original and the copy of the ability refer back to the same Tawnos's Coffin for their delayed triggered ability.  So when the coffin becomes untapped or leaves the battlefield two abilities trigger, each bringing back one of the two exiled creatures.

[SiegeX]

And both the original and the copy of the ability refer back to the same Tawnos's Coffin for their delayed triggered ability.  So when the coffin becomes untapped or leaves the battlefield two abilities trigger, each bringing back one of the two exiled creatures.

I know that when you make the copy of things, text that refers to the cardname essentially gets changed to ~this~. So I would have thought that the copied ability would reference an object that doesn't exist and thus the exiled creature would never come back.  So, how do you know when a copy references ~this~ object vs an existing object like in this case?

[Clariax]

I know that when you make the copy of things, text that refers to the cardname essentially gets changed to ~this~. So I would have thought that the copied ability would reference an object that doesn't exist and thus the exiled creature would never come back.  So, how do you know when a copy references ~this~ object vs an existing object like in this case?

Text on a card that refers to itself by name means "this card," so if some other card gains that ability, the ability on that new card refers to itself also.  This is completely different than copying an ability on the stack.  The new ability will use the same values, have the same sources, and the same choices as the original, unless the effect that creates the copy specifically says otherwise, so both the original and the copy refer back to the same Tawnos's Coffin.

[MaximumCDawg]

So, does Tawnos Coffin + Voltaic Key allow you to exile creatures for 4 a pop?  Until Coffin leaves play, that is.

1) Tap Coffin to use ability targeting a creature
2) Respond by activating key
3) Key resolves, untaps coffin, trigger return ability
4) Return ability resolves but does nothing
5) Original Coffin ability resolves and exiles creature for good?

[Clariax]

3) Key resolves, untaps coffin, trigger return ability

There's no return ability to trigger at this time.  The activated ability that exiles the creature creates a delayed triggered ability.  This delayed trigger isn't created until the activated ability resolves.  If you activate the coffin, then untap it and activate it again before the first resolves, you'll have 2 separate delayed triggered abilities that will trigger the next time the coffin becomes untapped (or leaves the battlefield).

[Delha]

3) Key resolves, untaps coffin, trigger return ability

I think what may be confusing you is that the return function is part of the same ability that exiles the creature in the first place.

Cards like Oblivion Ring have two distinct abilities, whereas Coffin has an embedded clause instead. This is why (as Clariax explained in more detail) it is impossible for the return to happen before the initial exile.