Dusk's Razor

When Helios rises, equipped creature gets +1/+2 and gains lifelink until end of turn.
When Luna rises, equipped creature gets +2/+1 and gains deathtouch until end of turn.
{w}{b}: Equipped creature loses Lifelink and gains Deathtouch or loses Deathtouch and gains Lifelink.
Equip: {w}{b}