When people look at this card, it seems that it requires a lot of mana to be able to accomplish anything. But it is actually not true, as pointed out by Burn players in Modern.
You would need only three mana to cast a copy of Lightning Bolt and a copy of Lava Spike from your graveyard and your library, which equals extra six damage.
With this kind of perspective Finale of Promise could easily become one of the Burn staples, if enough players will notice its level of power.
For more War of the Spark guides in MtG check out the list below: