Split cards have both their sides names, their mana value is the sum of both sides mana values, and their colors are the sum of all their sides' colors everywhere other than the stack
Rarity: P #: 3 Card Type: Legendary Land
Card Text: Whenever you attack, each opponent loses X life and you gain X life, where X is the number of attacking creatures
Im sure the card that most people thought of with Finale of Devastation is Craterhoof Behemoth, which might actually be overkill
Sadly, control decks are some of the worst decks for flipping battles since they usually don't play many creatures, which means the Serra Angel backside is unlikely to show up very often
The cards real strength, however, lies in the fact that colorless decks like Eldrazi Tron can run this without too much of a cost