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That said, we've hit a ton of expensive spells along the way here, which doesn't bode well for our plan of having cheap cards to keep things rolling and to keep our opponents drawing cards and giving us triggers

You can destroy any Spell or Trap card on the field for no downside

There just arent very many of those cards around

Faceless Haven can tap itself to animate, and then three more W is required to place the counter

The prices are reasonable for the products

Mana Crypt (Kaladesh Inventions Series) The most valuable Magic card not on the Reserved List, Mana Crypt is valuable for similar reasons as Mana Vault and Sol Ring: it can easily add a lot of extra mana to the mana pool and enable some explosive early plays in a game