Menedians article is a great and well-researched article of some of the earliest combo decks in the history of our game
Secondly, they can be good finishers, eating enough Enchantments to alpha strike someone for lethal or, filling your yard with Phantatog, should your build require it
If the creature it's attached to leaves the battlefield, the Role token will be sent to the graveyard
// Sephiroth, One-Winged Angel Flying Super Nova As this creature transforms into Sephiroth, One-Winged Angel, you get an emblem with Whenever a creature dies, target opponent loses 1 life and you gain 1 life. Whenever Sephiroth attacks, you may sacrifice any number of other creatures
What is the cost of these changes