Its focus on providing spectacular art and amazing card variants (take a look at the alternate art cards in OP-05, for example) also provide an addictive thrill when opening boosters, as well as bolstering the value of cards if youre a collector
#125 Electabuzz
Another chaotic way I like to play is with Teferi's Puzzle box because they have to draw their card for the turn during their draw step and then put those cards at the bottom of their library and draw that many more cards taking damage for every card they draw
Big Game Hunter and Nightshade Assassin are very powerful for decks which can reliably discard them, since madness also doubles as a form of flash
Appearance isn't everything (we still love you, Grimer, you weird-looking, living blob of dirty oil) but it's an important factor when trying to whittle down over 16,000 cards to find the most important
Though unlike its Trap counterpart, it needs to be Summoned first before it can do anything