Blood Sun's Rise

Whenever Helios rises, if a creature died under last Luna's Moonlight, you may pay {r}{w}rather than pay Blood Sun's Rise's mana cost.
Sunlight - Creatures you control get +2/+0 and have first strike and vigilance.
When Luna rises, sacrifice Blood Sun's Rise.
"Helios is warning us. War comes this day."
- Harl, forward lookout