If I don't have land tax, I get 2-3 land and that's it for 5+ draws. Whenever I have land tax, I get land the very next card and for another five draws in a row.
Your shuffling algorithm is absolutely HORRIBLE!

On top of that I had 2 of the 2 land tax in my opening hand plus 2 of only 2 other cards I had in my deck. I played a mulligan and got the exact same 2 land tax and 2 of only 2 other cards I had in my deck.

I have NEVER seen this happen with a real work shuffle in the 20 plus years I've played magic. You REALLY need to revamp your shuffle algorithm something fierce because the one you have is DEFECTIVE!

In addition to that, I'd add photos to this post but every time I do, it says it can't recognize the image size even though the image size is clearly visible.

For as much as you charge for gems, tournament play and fricken card sleeves, these should not be an issue.