Green Baboon, Defender of the Forest

Edison Card Text
① When this card is in your hand or GY, when a face-up Beast you control is destroyed and sent to the GY (except in the Damage Step):
You can pay 1000 LP; Special Summon this card.
No targeting
No Damage Step effect
Banlist • Unlimited
Interactions
When does Green Baboon trigger, and can it be used in the Damage Step?✓
A Beast you control is destroyed by battle.
Green Baboon triggers when a face-up Beast you control is destroyed and sent to the GY, and it cannot be used during the Damage Step.
Can Green Baboon activate during the Damage Step?!
A Beast is destroyed by battle during the Damage Step and you consider Green Baboon's trigger.
No. The cited 2010 errata document confirms Green Baboon cannot activate in the Damage Step.
Rulings
edisonformat.net
● You can only activate 1 Trigger Effect in your hand per chain.
(You can't activate the ① effect of this card more that once per chain, even if you have multiple copies in your hand/GY).
● This card's effect can't be activated in the Damage Step, so it can't be activated when a Beast is destroyed by battle.
edisonformat.com
(1) When a Beast-Type monster you control is destroyed and sent to the Graveyard, you can pay 1000 Life Points to Special Summon this card from your hand or the Graveyard.
The (1) optional "
When... you can...
" Trigger Effect can miss the timing.
This effect can be activated during either player's turn.
This effect can activate even if the destroyed monster was Beast-Type by "DNA Surgery".
Y
ou can only activate the effect of 1 “Gree
n
Baboon, Defender of the Forest,” even if multiple c
opies are available in your hand/Graveyard.
The (1) Effect CANNOT ACTIVATE:
during
the Damage Step [REF1], [REF2].
if the destroyed Beast-Type monster was being treated as a Spell Card (by "Relinquished").
if the destroyed Beast-Type monster was face-down.
if the Beast-Type monster was destroyed as Chain Link 2+.
if the last thing to happen when resolving an effect was not the destruction of the Beast-Type.
if your only Green Baboon on the field was destroyed and sent to the Graveyard. It must be in the hand / Graveyard when your Beast-Type monster was destroyed.
if your only Green Baboon and another Beast-Type are destroyed simultaneously (by "Lightning Vortex"). It must be in the hand / Graveyard when your Beast-Type was destroyed.