Takenuma, Abandoned Mire
Legendary Land
: Add 
.
Channel — 
, Discard this card: Mill three cards, then return a creature or planeswalker card from your graveyard to your hand. This ability costs 
less to activate for each legendary creature you control.
Sam Burley
Kamigawa: Neon Dynasty (NEO)
• #278Rulings
If a channel ability requires a target, you may not activate it without a target just to discard the card.
(wotc • 2022-02-18)
Discarding the card is part of the cost to activate a channel ability.
(wotc • 2022-02-18)
The creature or planeswalker card you return to your hand is not chosen until after you mill three cards. You may choose a creature or planeswalker card from among all the cards in your graveyard, including the milled cards.
(wotc • 2022-02-18)
Rulings
If a channel ability requires a target, you may not activate it without a target just to discard the card.
(wotc • 2022-02-18)
Discarding the card is part of the cost to activate a channel ability.
(wotc • 2022-02-18)
The creature or planeswalker card you return to your hand is not chosen until after you mill three cards. You may choose a creature or planeswalker card from among all the cards in your graveyard, including the milled cards.
(wotc • 2022-02-18)