Firebird

 This card's effect is similar to Maji-Gire Pandas in the fact that both cards come from the same initial booster pack (Flaming Eternity) and each have an ability in which they gain 500 ATK whether another monster of their Type is destroyed.

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OCG Rulings

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When a Winged Beast-Type monster is destroyed and sent to the Graveyard, this card's effect activates (and begins a chain).: Effect Monster > Firebird

The effect can activate during the Damage Step

Previously Official Rulings

The effect of "Firebird" is a Trigger Effect that activates when 1 or more Winged Beast-Type monster(s) on the controller's side of the field are destroyed. If the monsters were destroyed as a result of battle, the timing of this effect is at the end of the Damage Step, when the monsters are sent to the Graveyard.

You can chain to the activation of "Firebird's" effect, including with "Divine Wrath".

If 2 or more Winged Beast-Type monsters on the controller's side of the field are destroyed at the same time, the ATK of "Firebird" only increases by 500 points.

Winged Beast-Type tokens on the controller's side of the field are included and will increase the ATK of "Firebird" when destroyed.

Monsters on the controller's side of the field that are changed to Winged Beast-Type by "DNA Surgery" are included and will increase the ATK of "Firebird" when destroyed.

When face-down Winged Beast-Type monsters are destroyed (by a card effect), the ATK of "Firebird" does not increase.

The ATK increase from the effect of "Firebird" remains as long as "Firebird" remains face-up on the field.