The title is pretty self explanatory.
Place down a lifecycle device. The event should track when the game starts.
Now, place down a wire repeater. The delay should be as long as you want, but it should be a small number.
Now, place down another wire repeater with no delay. Wire the wire repeater to the other one, and connect it to an item granter that grants you -1 of the quantum portal. DO THIS FIRST, BECAUSE OF AUO.
Wire the delayed wire repeater again to an item granter that gives you one quantum portal.
Start the game, and spam the number 2. This is what it should look like:
You could make this an OP upgrade in a battle royale.
You could destroy a 10,000 health barrier in less than 10 seconds like what I did.