Favor of Jukai
Enchantment — Aura
Enchant artifact or creature
As long as enchanted permanent is a creature, it gets +3/+3 and has reach.
Channel — 
, Discard this card: Target creature gets +3/+3 and gains reach until end of turn.
The land chooses its own champions.
Howard Lyon
Kamigawa: Neon Dynasty (NEO)
• #184Rulings
Discarding the card is part of the cost to activate a channel ability.
(wotc • 2022-02-18)
If a channel ability requires a target, you may not activate it without a target just to discard the card.
(wotc • 2022-02-18)
Rulings
Discarding the card is part of the cost to activate a channel ability.
(wotc • 2022-02-18)
If a channel ability requires a target, you may not activate it without a target just to discard the card.
(wotc • 2022-02-18)