Removing from play 1 Pyro-Type monster in your Graveyard is a cost to activate this card’s effect.
Paying 500 Life Points during your Standby Phase does not start a Chain.
This card’s effect does not target.
If "Elemental Hero Wildheart", or another monster that is unaffected by the effects of Trap Cards, attacks directly, you cannot activate the effect of "Firewall".