Obeka, triggering its ability, causing you to get that many additional upkeep steps after this one.
Move to your first upkeep step.
At the beginning of that step,
Descent into Avernus triggers, putting two descent counters on it, then causing each player to create a Treasure token for each descent counter on it, and then dealing 1 damage to each player for each descent counter on it.
Repeat steps 2 and 3 for all remaining triggers.
Results
Near-infinite Treasure tokens for all players.
Near-infinite damage to all players.
Metadata
Bracket tag
RuthlessBracket 4+
For competitive decks at brackets 4+
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.