RFC: Limit available natural features "cards"?

[mlange-42]

Currently, natural terrain features can be placed without limit.

This lead to players adding terrain or features, just to get something rare, like rocks or trees on scenarios where they are limited.

Maybe there should be some mechanics that limit the terrain and natural features the player can place?

Options:

• A building that unlocks X cards
• A building that unlocks X cards/minute
• Total cards, or cards per minute, determined by some existing statistics