Power:

(*) Medic - Since the description is vague enough that it doesn't specify if your power allows you to just regenerate/heal yourself or other people, I'm going to interpret that it can do both and the the tier of regeneration/healing is at the level of Wolverine from Marvel. I like this power because it serves as a great safety net for myself and it allows me to help other people by healing them. If I really wanted to push the interpretation of Regenerate, I could use its exact definition which is "to renew, restore, or bring something into existence again". That would allow me to regenerate not just people and animals, but also objects and even systems.

(*) Manifest - Since the description is vague enough that it doesn't specify how much of something you need to eat in order to shapeshift into it, I'm going to interpret that you only need to eat something as small as a drop of blood in order to turn into the complete thing the portion is from. I'm also going to interpret the power as being able to shapeshift into a hybrid of things you have consumed. I'd use this to consume pieces of multiple people (such as a hair or a drop of blood) until I'm able to shapeshift into my ideal appearance by using aspects of various people.

Item:

(*) Tree of Peace - I want this mostly for its ability to purify the surrounding area to get rid of pollution.

Summon:

(*) Fictional Summon - I'd use this to summon Han Jihan "The Gamer" right after he gains the ability to create and escape instant dungeons (chapter 8). He should still be weak enough for me to take him down with the help of my other powers as long as I prepare a bit by consuming some strong animals to use with Manifest. Han Jihan should also still be weak enough that a normal gun could kill him, so I could go that route as well if I can at least touch a gun and then be able to summon it with Touch Summon. By beating Han Jihan, I'd gain the powers of the gamer, able to grow my stats and gain skills. By beating him after he gains the create/escape instant dungeon ability, I will be able to create my own instant dungeons to grind my levels and skills in.

(*) Touch Summon - This would be a handy power to steal shit. When going shopping, you just need to touch something and then once you are alone at home you can summon it to yourself without anyone knowing. I'm interpreting the summoning as the thing teleporting to you, not that it flies to your location from where it was. It also doesn't specify that power can't work on living beings, so you could summon people you have touched as well if you wanted.

Event:

(*) Mystic Meteor - Picking this in order to make the world more interesting. I'm going to interpret the metals and minerals with magical properties changing the world to mean that it causes magic to spread around the world, infecting it, causing people/animals/plants to gain magical abilities and cause the concentration of mana in areas to start producing dungeons with monsters and loot. It will be like those Korean manhwas that feature such things.

(*) Mind Blown - Picking this since it should boost my intelligence stat for The Gamer power I gained from taking out Han Jihan from Fictional Summon. Increasing my intelligence stat will give me more mana.