Hi, I am Curse! This is my tips (Maybe it works?) on how to clear endless mode.

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YouTube link: https://youtu.be/6vTMA77edhM

Tips before patch:
1. Focus on XP items such as Golden Key, Wooden Sticks, and Compass also XP Modifier for fast level up which provide extra stats.
2. Get items like Pickup Pick, Item Chest Chest and Ring of Power for extra stat and supports.
3. Then focus on luck. (Important as high luck = better military training rarity)
4. Go for either weapon damage or weapon critical chance or armor or dodge chance first, then only consider weapon cooldown.
5. If those are maxed out, then go for health regen or max health or speed.
6. Only consider ability's card after most of the above maxed out.

Simplify:
(In order of importance)
XP Item/card , Ring of power typed item, luck , weapon damage item/card, weapon critical chance item/card, armor/dodge item/card, weapon cooldown item/card, health regen item/card, max health item/card, any ability item/card or life steal.

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After patch (17 Apr 2024), the cards stats were halves and turned into Infinite instead of common. But it still works for Ghost solo.

YouTube Link: Coming soon - processing

1. You will need at least 120% starting and increasing to 140% as the time goes on.
2. Focus mainly on damage and crit chance. Dodge and armor is secondary.
3. You can ignore shuriken and Protocol: Critical if you wish as it does not help much.
4. Hologhost is very very helpful in this mode as it will help you attract away almost all of the zombies and let you get the powerup or heal for a short period of time.
5. Always take thousand cuts and it is pretty broken now.

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Any comments and advice are welcomed! Hope I can help!