Most madness cards get a highly reduced cost when played for madness, so as long as you have a somewhat decent mana base on the field, you can draw a ton of cards while also playing everything you discard
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Many of our players are motivated to collect, to customize their decks, and express themselves through their choices of which version of a card to play
Im not super excited about the Modern Trash for Treasure options, especially without Faithless Looting, but Bartered Cow is a reasonable card for a reanimator shell that needs to control an artifact
Splinter Twin pairs with creatures like Deceiver Exarch to make an endless stream of hasty tokens, and for years that combo control shell was one of the main pillars of Modern
In the card game, however, its just a royal pain in the ass