Xanos the I.

+2: each player gets one damage for each artefact they control, then you may draw a card for each player dealth damage was this way
-2: you get an artefact with: "artefacts you control becomes 1/1 artefact creatures with flying in addition to there other abbilities and types"
-16: you get an artefact with: "artefacts and creatures you control get +1/+1 ,Trample and annihilator 1"