You have an artifact creature in hand with the mana to cast it.
Steps
Cast any artifact creature by paying its mana cost.
When the artifact creature enters as an Ally due to
Leyline of Transformation,
Haru triggers, earthbending the artifact creature, as it's a land due to
Toph.
Activate
Evereth by sacrificing the artifact creature.
When the creature dies,
Haru triggers, returning the creature from your graveyard to the battlefield.
When the creature enters as an Ally due to
Leyline of Transformation,
Haru triggers, earthbending the creature, as it's a land due to
Toph.
Resolve the
Evereth ability, putting a +1/+1 counter on
Evereth.
Repeat from step 3.
Notes
If you have a way to kill
Evereth and 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 ETB.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Infinite damage.
Infinite death triggers.
Infinite landfall triggers.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.