Once a Cryptic Spires has two colors circled, those colors are considered to be printed on the card.

You circle two colors as you put Cryptic Spires into your deck before any games begin. Which colors are circled must be clear and understandable to all players.

The circled colors are part of the copiable characteristics of the card. If another permanent becomes a copy of Cryptic Spires, its mana ability will produce the same colors as the permanent that was copied.

The mana ability is linked to the colors circled on the card. If a permanent somehow gains that mana ability without becoming a copy of Cryptic Spires, the ability it gained won't produce any mana as it resolves.

Many Double Masters 2022 limited decks will include multiple copies of Cryptic Spires. You can choose the same two colors for each of them, or you can make different choices for different cards.

The circled colors only affect what colors of mana the last ability produces as it resolves. They do not make Cryptic Spires those colors. It is still colorless.