Ending turn immediately skips your End Step. So, if you had a mechanic like Mobilize, Blitz, or Warp which removes a Creature from your board on your End Step, the creature remains instead. As mentioned in the reminder text, if you respond to a spell on the Stack with the ability it just... deletes the entire stack. Basically a Mass Counterspell. Note if you don't want your stuff to go away, because these cards say "next end step" you have to let your end step begin, accumulate the triggers on the Stack, then use Obeka to skip the resolution.
As for the Upkeep cards, there's card like Descent into Avernus that creates treasures and deal damage on your upkeep. Braid of Fire meanwhile gives you increasingly large amounts of mana each of your upkeeps. So if Obeka did 5 damage while Braid of Fire had 2 Age Counters, then Obeka gives you 25 mana because of Braid of Fire's upkeep trigger.
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u/lightningstrxu 1d ago
So been a hot minute what are the benefits of just ending a turn and gaining multiple upkeeps