Attention: In the following I pretend that
Restoration Angel can flicker
Oblivion Ring.
Restoration Angel cannot flicker
Oblivion Ring. However it can flicker o-ring style cards such as
Fiend Hunter and
Leonin Relic-Warder.
Note that
Restoration Angel has a flicker (
Cloudshift) function and not a
Oblivion Ring function. Let me show that the infinite combo still works. If two o-ring style cards are linked, then
Restoration Angel can come into the one in play. First, o-ring 2 will be exiled and o-ring 1 will be brought back. O-ring 1 can then exile
Restoration Angel. This may look like
Restoration Angel is stuck, but
Restoration Angel's second effect is still on the stack from when it was played, meaning that o-ring 2 is now brought back into play and o-ring 1 is exiled. Now that o-ring 1 is exiled,
Restoration Angel is back into play. We now let
Restoration Angel's ETB effect to flicker o-ring 2, and well, we also have an infinite combo. A combo with
Restoration Angel can also be achieved if it is the first card to be played, and then it is linked by an o-ring and that o-ring gets linked by an o-ring. If
Restoration Angel is the middle card to be played then things get a little bit more complicated in terms of compatibility, because now for it to work o-ring 1 (targeted something irrelevant) is flickered by
Restoration Angel, and then o-ring 1 has to exile
Restoration Angel and we're back to the "
Restoration Angel first" situation. This also implies that the o-ring 1 style card and the
Restoration Angel have to be able to exile each other.