Charge of the Light Brigade

Edison Card Text
① Send the top 3 cards of your Deck to the GY; add 1 Level 4 or lower "Lightsworn" monster from your Deck to your hand.
No targeting
No Damage Step effect
Banlist • Limited
Interactions
Is Lightsworn milling a cost, and does Ryko mill as part of its effect?✓
A player is comparing Ryko's effect to Charge of the Light Brigade.
Ryko's mill is part of its effect, not a cost. Charge of the Light Brigade mills as a cost in Edison.
If you mill your last target with Charge, do you reveal your Deck?!
Charge resolves and no valid targets remain.
Online, you do not reveal. In person, briefly fan the Deck for verification; the Deck is shuffled regardless.
Rulings
edisonformat.net
● You can't activate this card unless you have at least 4 cards in your Deck.
● You can't activate this card unless there is at least 1 level 4 or lower "Lightsworn" monster in your Deck. If the last possible search is sent to the GY as part of this card's cost, all 3 cards remain in the GY, and no card is searched.
edisonformat.com
Send the top 3 cards of your Deck to the Graveyard. Add 1 Level 4 or lower "Lightsworn" monster from your Deck to your hand.
Sending 3 cards from the top of your Deck to the Graveyard is a cost.
Charge cannot be activated while "Dimensional Fissure" / "Macro Cosmos" is active.
If the last Level 4 or lower "Lightsworn" in your Deck is sent to the Graveyard as cost, briefly show your Deck to your opponent to verify that no Level 4 or lower "Lightsworn" monsters remain in your Deck.
You cannot activate this card if you have 3 or less cards in your Deck.
Charge does not target the "Lightsworn" in Deck, it can activate with "
Aurkus, Lightsworn Druid
" face-up.