There are lots of ways to make even more Spiders in black and green, such as Arachnogenesis, Arasta of the Endless Web, and Curse of Clinging Webs
To be more exact, Zapdos EXs Alternative Art is currently selling for around $50 , give or take
Once a Locations Willpower is reduced to zero or less, by having Damage counters applied to it that are equal or greater than its Willpower value, the card is banished and placed in the owners discard pile
Beyond these lands, the mana base utilizes a combination of fetches, shock lands, and triomes to assemble a functional mana base, alongside various lands that enter untapped
If the exiled card is a land card, repeat this process
Alternatively, you could just make the cards playable with any color of mana, which is the standard for how these cards work