Homicidal Seclusion 
Enchantment
As long as you control exactly one creature, that creature gets +3/+1 and has lifelink.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
As long as you control exactly one creature, that creature gets +3/+1 and has lifelink.