It's amazing because it's a self-fueling engine: It mills cards and causes lands to leave your graveyard for its ability and others
Indestructible features on hundreds of cards, white being the main benefactor
Some aggressive or combo decks use these types of cards as interaction points because theyre somewhat versatile, cheap, and you will usually win the game before the downside comes back to bite you
Duelists Heritage can target opponents creatures, helping you shred life totals even quicker
You need to gather your power before commencing that all-out attack, so if your opponent can prevent you from getting board control early on, youll get crushed before you can get your vampires ready for war
Luckily for us, two cards from Fate Reforged help to make this possible