[MTG] - Ruling question about priority-?

Question

I've been playing MTG for sometime now, but the idea of having and passing priority is still vague to me. Please let me know if I'm understanding the following situations correctly, and if I'm not, the most clear explaination would be a 5 star answer.

Situation 1: My Explore accelerated into a turn 3 Ajani Vengeant. I now have priority, since I have casted and successfully resolved a spell. Now if I choose to active Ajani's ability, or do anything else, even tapping a land for a mana, would give my opponent a chance to respond by casting a lightning bolt on Ajani and killed him. However, before I choose what to do after I resolve him, my opponent can not cast that lightning bolt to kill Ajani because I have not passed my priority.

Situation 2: I Show and Tell a Omniscience into the battlefield. My opponent do not have the priority to cast naturalize on it before my next action; however if he has a creature that is capable of respond to enchantments coming to battlefield (for example, "whenever enchantment ETB, you may gain 4 life"), he may put this triggered ability onto the stack. In this case, if the ability resolves, he still does not have the priority because A. he didn't cast a spell, and B. he didn't resolve a spell. 
I now cast Time Stretch, my opponent can now naturalize my Omniscience, by stack.

? · Accepted Answer

1. Right, for the most part. Once a spell resolves, the active player (you) gets priority. There's no time between Ajani resolving and you getting priority for your opponent to do anything. The one thing you got wrong is tapping a land for mana. Mana abilities don't use the stack, and they resolve instantly. You can get mana from a land without passing priority.

2. Again, almost correct. If Omniscience entering the battlefield doesn't trigger anything and the stack is empty afterwards, you can cast Time Stretch straight away, before your opponent can do anything about it. However, if an ability triggers, then you can't. Sorceries can't be cast unless the stack is empty. So the ability will trigger and go on the stack straight after Omniscience comes into play and Show and Tell has finished resolving. You must let that ability resolve before you can cast a sorcery spell. And for the ability to resolve, you must pass priority. This means your opponent can Naturalize Omniscience before you can cast a sorcery.

Again though, that's only if something triggers upon Omniscience coming into play. And, of course, you can always cast an instant or activate abilities before your opponent does anything.

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[MTG] - Ruling question about priority-?

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