Reinforced Ronin
Artifact Creature — Human Samurai
Haste
At the beginning of your end step, return this creature to its owner's hand.
Channel — 
, Discard this card: Draw a card.
Kekai Kotaki
Kamigawa: Neon Dynasty (NEO)
• #158Rulings
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)
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)