If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs
Lander tokens are essentially token versions of Wayfarer's Bauble, a very playable mana rock on its own
Grandmother Fa Spirited Elder is better than Thumper Young Bunny, but her ability is quite obvious and can be avoided
Crucible of Worlds (Tenth Edition) Tilling the land Fetch lands are incredible, because they allow you to find the land you need to help smooth out your colour options and also help thin the number of lands in your deck, making it more likely youll draw something powerful
The only final note Ill leave is that I did consider a strong throughline of extra attack step cards, but theres a sequencing issue (they dont work if you cast them off of Tetsuo)
Also, since almost every Magic set has a relevant 5- or 10-land cycle, Im taking most of them out except those that do something relevant instead of only generating mana, like creaturelands