1. Necessarily need to full upgrade talent tree of Aster and Elena
2. Less important full upgrade talent tree of Benimaru and Vera
3. All other characters have a pretty small nice bonus, no more

1. Rain of Fire
2. Tornado
3. Explosive Trap
4. Bone Dragon

This weapons you can get from level-up upgrades, but they useless for us here.

1. Dwarf Craftsman
2. Totem of the Bear
3. Pigeon Soup - Trenta (or Mythic Sword Arts)
4. Beast-from+

I didn't do anything special to get this cards, hope you have it.

We choose Elena and start this level.

After spawn - choose 5 weapons / skills (thanks to Aster bonus). Should focus on 1 or 2 weapons like Boomerang Dagger or Fireball or native Shadow Bubble.

After that - start moveing to Event objects, but picking it only after get all 6 slots of weapons / skills filled. Ofcourse pick skills to make super version of your weapons. Try to get 6+6 as soon as possible to start picking bonuses from Events.

The perfect list of weapons is:
Shadow Bubble - native
Boomerang Dagger
Fireball
Chain Lightning
Air Blast
Giant Cannon

Like bonuses be nice to get
Fountain
Magic Pinball
ice Shards

In Mercenary section between
Call of the Wild
Healing Totem
Hire minions
best chooise
Call of the Wild

Feel free to pick cards as soon as possible. Forget about regeneration and damage reduction - we build glass canon.

How all this looks like - you can see on the video.

Yes, this guide acceptable for other characters, include Benimaru.

https://youtu.be/AV_2eJqKd30