Shuffling cards causes uneven mana distribution - ways to fix that?
The only thing you're doing wrong is trying to "fix" uneven mana distribution.

If your deck is shuffled correctly &mdash; that is to say, if it's actually randomized &mdash; there's almost always going to be clumps of lands. You will sometimes have games where you're mana-screwed, and you will sometimes have games where you're mana-flooded. That's normal; it's supposed to happen.

That 1-2 cards per land card thing you're describing is called mana weaving. It's the only way to really "fix" clumping &mdash; and it's a form of cheating because it's trying to fix your deck with an even spread and make your deck less random and not properly shuffled. You can see here where I asked about that a few years ago: Is Mana Weaving ok if it&#39;s followed by a thorough shuffle?. The explanations I received were pretty helpful in understanding what is really meant to happen with shuffling a deck.

In general pile shuffling (when you're not using it to mana weave) is fine and all, but it's not regarded as an effective way to randomize your deck. Tournament rules say pile shuffling alone is not a good enough way to do a shuffle. Here's what I'd recommend:


Sleeve your cards.
Do overhand and riffle shuffles.
If you can't do riffle shuffles, try mash shuffles. However they'll damage your sleeves if you do it poorly and force your cards, and sufficient damage will eventually mark a card, letting you know where it is in your deck &mdash; marked cards aren't permitted so you'll need to replace the sleeve.
Accept that you're going to get lands clumped in your deck; it's supposed to happen.
Use land fetches, tutors, draws, scrying, shuffle, and other forms of card advantage &mdash; they help you move past clumping.