Legendary Planeswalker — Arlinn
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)
+1 : Until your next turn, you may cast creature spells as though they had flash, and each creature you control enters the battlefield with an additional +1/+1 counter on it.
−3 : Create two 2/2 green Wolf creature tokens.
Legendary Planeswalker — Arlinn
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)
+2 : Add
.
0: Until end of turn, Arlinn, the Moon's Fury becomes a 5/5 Werewolf creature with trample, indestructible, and haste.
Double-faced permanents with daybound transform to their nightbound faces as it becomes night. Similarly, double-faced permanents with nightbound transform to their daybound faces as it becomes day. This happens immediately and is not a state-based action. It happens any time it becomes day or night, not just during the untap step.