If you activate a "Fire Formation" Spell/Trap Card (except during the Damage Step): You can Special Summon this card from your hand, then you can Special Summon 1 "Fire Fist" monster from your GY, except "Brotherhood of the Fire Fist - Panda", also you cannot Special Summon monsters for the rest of this turn, except "Fire Fist" monsters. If a "Fire Fist" monster(s) you control would be destroyed by your opponent's card effect, you can send 1 face-up "Fire Formation" Spell/Trap you control to the GY instead. You can only use each effect of "Brotherhood of the Fire Fist - Panda" once per turn.
I have a love-hate relationship with this card, honestly. On the one hand, it's fantastic and does so much good stuff for Fire Fist, reviving Raven, Rooster or Ram (if you play it), the less relevant protection effect against random stuff like TT, making Eagle with just it and a formation, being a free 2100 body on the board, stacking fortress and a bunch of other random stuff. On the other hand, it has pigeonholed Fire Fist into spamming Ravens and Pandas and turns literally every Fire Fist deck into Panda spam. More specifically, it wrecked my favorite build of the deck (4 Axis), while massively buffing a spammy playstyle that doesn't feel like Fire Fists at all, now Fists just try and combo off as soon as they can, it's not the same deck anymore and I wish so much that this was a Level 4 with a grindy effect, rather than promoting spam. In general, part of me mourns the days of traditional grind decks. Salamangreat fill the niche for me of the value stack of good cards deck, but seeing my favorite archetype morphed into some ungodly clusterfuck of a combo deck makes me sad.