This card is a great counter against cards like "Lava Golem", "Volcanic Queen" and to a lesser degree "Samsara Lotus". When cards like these are sent to your side of the field, more than likely your opponent would have made sure you can't attack with them. For cards like "Samsara Lotus" that are not FIRE, use "DNA Transplant".
This card works well with, of all cards, "Manticore of Darkness"; because you need to ditch a Beast, Beast-Warrior or Winged-Beast monster from your Hand or your side of the field to the Graveyard to revive it, you can reuse the same "Manticore" for "Ignis'" effect, and build up your Graveyard with FIRE monsters for just a little more damage each time.
Activate this card, then chain cards to it that will let you dump more FIRE monsters into your graveyard; since "Flame Spirit Ignis" calculates its damage from the number of FIRE monsters in your Graveyard during resolution, thanks to how chains resolve, you'll hit the opponent for far more damage than you would normally, if you activated "Ignis'" effect without a chain.