Stromkirk Bloodthief 
Creature — Vampire Rogue
At the beginning of your end step, if an opponent lost life this turn, put a +1/+1 counter on target Vampire you control.
Legality
standardLEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL