Mardu Runemark 
Enchantment — Aura
Enchant creature Enchanted creature gets +2/+2. Enchanted creature has first strike as long as you control a white or black permanent.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL