Dragon Ice

Edison Card Text
When your opponent Special Summons a monster, you can discard 1 card to Special Summon this card from your hand or Graveyard. There can only be 1 face-up "Dragon Ice" monster on the field.
Gladiator's Assault • 2007-11-14
No targeting
No Damage Step effect
Banlist • Unlimited
Interactions
Can Dragon Ice be Special Summoned during the Damage Step in Edison?!
An opponent's attack would destroy a monster and Dragon Ice is in hand.
Yes. Edison-era rulings allow Dragon Ice to activate during the Damage Step.
With Black Garden face-up, who Special Summons the Rose Token and can Dragon Ice trigger from it?!
You control Black Garden and your opponent Summons a monster, creating a Rose Token on their field.
The controller of Black Garden is treated as the player who Special Summons the Rose Token, so Dragon Ice does not trigger off the opponent's monster being Summoned.
Rulings
edisonformat.net
●The optional Trigger Effect can't be activated in the Damage Step.
●This is similar to Green Baboon, Defender of the Forest's, whose rulings were updated.
●This effect does not target.
●Discarding 1 card is a cost. Dragon Ice itself can be discarded as cost, and then Special Summon from your GY.
●The Unclassified effect applies while Dragon Ice is face-up. This effect can't be negated.
●You can Special Summon multiple copies of Dragon Ice by Return from the Different Dimension. However, excess copies will be destroyed by game mechanic before you proceed to resolve the next link in the chain (or enter an open gamestate).
edisonformat.com
(1) When your opponent Special Summons a monster, you can discard 1 card to Special Summon this card from your hand or Graveyard. (2) There can only be 1 face-up "Dragon Ice" monster on the field.
The (1) optional Trigger Effect CANNOT be activated in the Damage Step [REF]].
This is similar to "Green Baboon, Defender of the Forest's", whose rulings were updated [REF]].
This effect does not target.
Discarding 1 card is a cost. "Dragon Ice" itself can be discarded as cost, and then Special Summon from your Graveyard.
The (2) Unclassified effect applies while "Dragon Ice" is face-up. This effect cannot be negated.
You can Special Summon multiple copies of "Dragon Ice" by "Return from the Different Dimension". However, excess copies will be destroyed by game mechanic before you proceed to resolve the next link in the chain (or enter an open gamestate).