I think this deck would benefit a lot from narrowing the focus a bit. If you plan to spend this much money, you can get way more bang for your buck. As just one example,
Overcome is a strictly worse version of the original
Overrun. An even better version is
Triumph of the Hordes, but that one's a bit salt inducing.
To give you an idea, I'll link my
Omnath, Locus of Rage landfall deck. It's mainly landfall with a token sub theme. If you want more specific advice or have any questions, I'd be happy to go into more detail.
(This is a very casual deck and not meant as an example of great deck building. It just has a lot of the better landfall/ token cards in it.)
https://deckstats.net/decks/132279/1332884-omnath-locus-of-landfall