Kessig Naturalist (Showcase) (MID-310) - Innistrad: Midnight Hunt: (Showcase, Double Faced Transform)

Whenever Kessig Naturalist attacks, add R or G. Until end of turn, you don't lose this mana as steps and phases end.

Daybound

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Lord of the Ulvenwald

Other Wolves and Werewolves you control get +1/+1.

Whenever Lord of the Ulvenwald attacks, add R or G. Until end of turn, you don't lose this mana as steps and phases end.

Nightbound

Whenever this creature attacks, add or . Until end of turn, you don't lose this mana as steps and phases end.
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

Other Wolves and Werewolves you control get +1/+1.
Whenever this creature attacks, add or . Until end of turn, you don't lose this mana as steps and phases end.
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)