Delif's Cone
{0}
Artifact
{T}, Sacrifice ~this~: This turn, when target creature you control attacks and isn't blocked, you may gain life equal to its power. If you do, it assigns no combat damage this turn.
Gaze of Pain
{1}{B}
Sorcery
Until end of turn, whenever a creature you control attacks and isn't blocked, you may choose to have it deal damage equal to its power to a target creature. If you do, it assigns no combat damage this turn.