Cast the other legendary Elemental for its evoke cost by paying ({4} magic symbol) , causing you to sacrifice it as it enters.
The Elemental's persist ability and
Ashling trigger.
Resolve the
Ashling trigger, creating a token copy of the Elemental.
Resolve the persist trigger, returning the Elemental from your graveyard to the battlefield without a -1/-1 counter on it due to
Vizier of Remedies.
Put the nontoken Elemental into your graveyard due to the legned rule.
When the Elemental dies, its persist ability triggers, returning the Elemental from your graveyard to the battlefield without a -1/-1 counter on it due to
Vizier of Remedies.
Repeat from step 5.
Notes
If the chosen Elemental has an ETB, LTB or death ability, this combo can provide additional results from that ability. The chosen Elemental must also not enter with -1/-1 counter(s) on it.
Results
Infinite creature ETB.
Infinite creature LTB.
Infinite death triggers.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).