u/Professional-Tip762

These buffs wounld't be added all at once, it's "If not 1 then 2 then..." scenario:

don't need to stress what mundo should be (given his "fantasy" of an late game giant). I also don't need to stress out how weak his clear (as laner) is even after maxing E and having 1 complete item. Wormogs and HS both don't add much to make him end casters with 1 aa, he needs 1 complete item + 600hp (he'll roughly be 4000 hp lvl 12). I believe most frustrating point of mundo is his post lvl 8. His lvl 6 is still super duper weak, his 11 is playable but you still need to be very carefull. Theses changes tries to deal with the even and losing scenarios. That even riot knows and see as problematic for this champion

W -> Should give back the cast cost when you explode it on an enemy champion

Many people don't notice but casting W while full or 80%+ hp you lose more HP than if you were hit by the enemy (in most scenarios). Making hitting W very unintuitive early on. Possibly killing you way more often. It also makes so you need to know a min/max W scenarios for each matchup + adding the MR/AR you have so you also don't screw up by pressing W when 300 armor against a full ad comp, giving them free dmg over you. W should save you from the enemies, not be a trade off btw dealing youself (depends on your hp) true dmg and saving very mediocre amounts of HP.
In my opinion if you master W casting now, your laning phase becomes 2x stronger.

Passive -> should reward you more since it'll always lands on the enemy

Before going to the final one we need to remember. It's his only lvl scaling, that's why 2 items won't do the trick, he needs 16, an stable game and be ahead to look like a monster. He's has a very problematic (even rioters feel this) unrewarding, super lose or super win scenario. If he's way ahead, he can 1v3 but if he's even or behind he will feel almost like an spectator or useless bag of meat, that doesn't have CC nor can scape (can't even be near minions else he will get pickoff). His E (50% of his kit is this and his R):

Active -> 5%->6%, 9% on max adding situational +50% dmg when below 65%HP. It will grant his item scaling an actual scale in situations where he's low. Would also help his laning phase not be so horrible
Passive -> 2-3.2% -> 2-4%, Today 1250=40ad with 4% it would be 1000HP. It'll grant more his power spike earlier in the late game. Today he needs way to many items to start wave clearing and scaling.

Help these changes be heard by Riot balance team.

Theorizing good mundo buffs that will make the champion more rewarding

I hope that's not the future for mundo and Tanks alike