Dash, Database

You may look at the top card of your deck at any time.

Once per turn, you may play a Mechanologist item with cost 1 or less from the top of your deck as though it were an instant. It costs an additional

to play.

Rulings

From the Bright Lights + Round the Table release notes

Looking at the top of your deck is a static ability that affects the game rules, allowing you to look at the top of your deck as though it were standard private information to you. You don’t need to have priority to look at the top of your deck.
When any player would look at, or reveal cards from the top of your deck, those cards are still considered to be in the same order on the top of your deck, until they are explicitly moved somewhere else. E.g. If you opt 3, while looking at the top 3 cards of your deck, it does not change what card is on the top of your deck; you can not look at the 4th card as though it were on top of your deck unless you then put those 3 cards on the bottom as part of the opt ability.
You can only attempt to play a Mechanologist item with cost 0 or 1 from the top of your deck if you are able to look at it first. If another effect prevents you from looking at that card, you can not play it.
While you may look at the top of your deck at any time, you may only play that card when you have priority.
An action card played as though it were an instant does not cost an action point and can be played whenever the player has priority, otherwise it is still considered to be an action card.
If you play the top card of your deck, you may not look at the next top card of your deck until you have finished playing the card. I.e. you cannot use information about the next card to determine how you want to play the card.
If you resolve an effect that changes the top card of your deck, you may not look at the next top card of your deck until you have finished resolving the entire layer of the effect. I.e. you cannot use information about the next card to determine how to resolve the remainder of the effects.