You don't get to immediately change the board state, and it's most likely turn four, a point where both you and your opponent have already invested in whatever your cards in hand could have done
The card gets sealed into a hard plastic case (called a slab) with a label showing the card name, set, grade, and a unique certification number you can verify on PSAs website
The only closest card is a similar one print wonder, Shichifukujin Dragon, whose card is slightly less rare because its printing plates were never confirmed to be destroyed, unlike the 1996 World Champion's plates
Goblin Guide, however, is kind of like a Jackal Pup, but with haste, and a 2/2
I prefer Austere Command over either of the two choices as it serves as both Purify and a nice conditional Wrath, or sometime a mix of both
The legendary planeswalker has a prerelease promo foil version worth around $42