The best ones do both and force the table to answer them immediately or lose
There's been a lot of print variance over the years, and when you add in special printings like Challenger Decks reusing the same set symbols for cards produced by different printers at different times, or cards printed in other regions, there are often subtle but noticeable differences between legitimate identical cards
Najeela, the Blade-Blossom If you can develop some ways to get tons of any color mana, then Najeela, the Blade-Blossom is a wonderful card for attack-heavy decks: it's both one of the strongest 5-color commanders and best aggro commanders in the game
This was a trend they continued with all core sets until Sixth Edition
While there, she is visited by a time traveling Squall, who tells her to establish the SeeD Academy, and a defeated Ultimecia - the game's villain - who passes her abilities onto Edea