Ill-Tempered Loner // Howlpack Avenger

Whenever this creature is dealt damage, it deals that much damage to any target.
: This creature gets +2/+0 until end of turn.
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)
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Whenever a permanent you control is dealt damage, this creature deals that much damage to any target.
: This creature gets +2/+0 until end of turn.
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)