The madness cost is usually different from the casting cost as well
That draws X cards and loses X life, so your foe will lose three times X
If it becomes unattached to a creature, that creature must be sacrificed, so it's best to send that creature into the thick of battle and let it die in a blaze of glory.
The deck has a lot of sweet synergies and can do some really fun things, although there are times when we just get run over by aggro, especially if our opponent happens to be on the play
Right now, Dimir Reanimator is the deck to beat, and that is something that is very, very hard to do
That said, Lurrus of the Dream-Den pre- Companion errata is considered to be the best MTG card ever solely because it was banned in a format that encapsulated every card in MTG history