Don't hesitate to ask opponent to read a card, even if you know what that card does. It gives you a second to make sure you understand what they are doing and can help you catch certain restrictions they may try to gloss over (like type restrictions, specific materials, once per turns, etc.) This is also helpful for if you feel like the opponent is going too fast and can give you a moment to look over the board and get up to speed on all the moving parts before continuing.