The Solemn Vow

ADVENTURE: Doctor Assisted Homicide ({r}{r})
As an additional cost to cast this spell, sacrifice an artifact.
Doctor Assisted Homicide deals damage to a target creature or planeswalker equal to the number of Artifacts you control.

SOLEMN VOW:
Equipped creature gains +1/+1 and lifelink
Equipped creature gains trample if an opponent controls 3+ creatures.
Equip {r/g}{r/g}