Firdoch Core from your graveyard to the battlefield.
When
Firdoch Core enters,
Haru triggers, earthbending
Firdoch Core, as it's a land due to
Toph.
Resolve the
Evereth ability.
Repeat from step 3.
Notes
If you have a way to kill
Evereth and ({1} magic symbol) ({BR} magic symbol) available, you can do so after putting a significant amount of +1/+1 counters on it to deal damage to each opponent using its second ability.
Results
Infinite +1/+1 counters on a creature.
Infinite artifact ETB.
Infinite artifact LTB.
Infinite artifact sacrifice triggers.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite death triggers.
Infinite landfall triggers.
Infinite damage.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).