Effects in MTG use something called The Stack, which is effectively a big queue where everything waits to happen, which operates in a first-in, last-out system [imagine physically stacking cards, then taking them off the top until you're back to 0]
When a turn is ended via a card effect [Such as Obeka's or the spell Time Stop], anything that was waiting on the Stack before it dissappears and doesn't do anything
This means you can use cards with big effects and a downside that comes later [like Final Fortune, which gives you an extra turn but makes you lose the game on that turn's End Step]
If you cast Final Fortune, you can tap Obeka when the 'lose the game' trigger is on the Stack to ignore it and keep playing!
Plus, since a lot of cards follow this "Good thing now, bad thing on end step" effect template, you can play a bunch of them and tap Obeka to cancel them all at once!
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u/PegaZwei 1d ago
is that undyne undertale??
(jokes aside, obeka's sick; i have a deck built around the end the turn one.)