Individually these effects are marginal: but combined they form a card that was so good, many non-red blue base decks started playing red just to get it (plus Flametongue Kavu, to be perfectly fair)
I, of course, had other ideas
Works great in both Dimir and Orzhov templates
On the commander only list, I place a bigger emphasis on how well they support various archetypes
Overall, Animate Dead is a great card in a lot of black decks simply because it can give you double the value for your creatures, as well as your removal spells
First, you can get to the end of the dungeon in three steps by choosing to Oubliette yourself, or take the leisurely trip through the dungeon via both Veils of Fear and Sandfall Cell, where the deleterious effects are shared around the table