1R: Fangblade Brigand gets +1/+0 and gains first strike until end of turn.

Daybound

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Fangblade Eviscerator

1R: Fangblade Eviscerator gets +1/+0 and gains first strike until end of turn.

4R: Creatures you control get +2/+0 until end of turn.

Nightbound

{1}: This creature gets +1/+0 and gains first strike until end of turn.
Daybound (If a player casts no spells during their own turn, it becomes night next turn.)

{1}: This creature gets +1/+0 and gains first strike until end of turn.
{4}: Creatures you control get +2/+0 until end of turn.
Nightbound (If a player casts at least two spells during their own turn, it becomes day next turn.)