Avian Oddity and Windcaller Aven can target after being cycled, Keeper of the Nine Gales and Mist Raven let us return permanents to our hand, allowing us to re-trigger our scrying Birds, and Harrier Strix, Hunting Moa, and Whippoorwill all have different abilities to trigger Nadu
If more than one player discards a card with madness simultaneously, the player whose turn it is puts his or her madness abilities onto the stack first, then each other player does the same in turn order
But you can use it to, say, rearrange the power distribution of your team to destroy your opponents blocks, ensure that your Sword of Whatever and Stuff is equipped to an unblocked creature, and even use it defensively to make a meager blocker much stronger after you attacked with the creatures holding all your buffs
I had two main plans for my cube build, a control list and a midrange one