It has 180 HP one of the highest in the game and its attack, Rampaging Whirlpool, deals 140 damage enough to eliminate the vast majority of cards in a single hit plus removes one energy from a randomly selected card on the board, which could screw up your opponents strategy
That's what happens when you combine Tinker (which could get out the Jar almost immediately) with Megrim (so that your opponent would take 14 damage from a single Jar discard, assuming they could not play any cards in time)
The art continues in the modern Magic tradition of showing definitive events and creatures in gorgeous full colour, and individual cards even tell their own little stories
Senu, Keen-Eyed Protector, is a decent evasive creature that falls short in Modern
All the excitement I felt as a kid doing the same with real packs flooded in instantly
Even though all of these cards saw some amount of play, they never really captured the original intent of the ability