5/5 flying that draws a card is nice, and when you can choose a specific card that will help you the most, its even better
If no card is revealed, most likely because that player's library is empty, the exploring creature receives a +1/+1 counter
The EX era introduced multiple new kinds of cards, most notably Gold Stars which have become the holy grail of the entire hobby
Limited print runs, tournament prizes, and promotional cards given out at specific events are naturally scarcer
Cards like Pixie Guide, Krark's Other Thumb, and Bamboozling Beeble have similar effects
For example, the most obvious case I can currently think of is Mad Party because now you can afford in an ideal world- discarding all your 16 Mad Party members and then using Ditto to deal massive damage for just one double colourless energy