What does SPEED: Action allow you to do?

The correct choice highlights the ability to play a card with the SPEED: Action attribute during an Open State specifically in the active player's Action Phase. When a card has SPEED: Action, it indicates that the player can use it while taking their own turn, specifically when they are allowed to take actions, making it flexible and strategic during their gameplay.

In this context, an Open State refers to the condition during a player's turn where they can freely play cards, as opposed to other states where certain actions may be restricted. Choosing this option emphasizes the active involvement in the turn rather than reacting to the opponent’s plays, which is crucial for strategy in games like Riftbound.

The other choices present scenarios that don't align with the mechanics of cards with SPEED: Action, primarily focusing on limited or restricted play opportunities that would not utilize the potential of the card effectively. Thus, the assertion that such a card can be played in the active player’s Action Phase is essential for maximizing its use and advancing one's strategy.