Does the When Destroyed effect on this spirit activate when the number of cores on it becomes zero and it is destroyed?

Do I pay a spirit's summoning cost when summoning it from the trash using the When Destroyed effect on this spirit?

Can I use the symbol on this spirit for cost reduction when summoning a spirit from the trash using the When Destroyed effect on this spirit?

Does "view the top four cards of your deck" mean I also have to show them to my opponent?

Can I draw a card when this spirit is destroyed in battle?

Can I draw a card using the effect on Freezstal when my cost 2 spirit is destroyed by 【Curse】?

Can I draw a card using the effect on Freezstal when my cost 2 spirit is destroyed by magic during a flash window while it is participating in a battle?

If I return a destroyed spirit to my hand using the effect on this nexus, do bursts and effects which would trigger on its destruction activate?

I control an ST04-013 Soap Bubble Lakeside and my cost 2 spirit and cost 3 spirit are simultaneously destroyed. If the effect on this nexus reveals a cost 2 card on the top of my deck, can I add it to my hand?

What happens to a spirit when its BP becomes zero?