Weathermon, The Tombgaurd

Weathermon is counted as Master of Etherium
Master of Etherium's power and toughness are each equal to the number of artifacts you control.

Other artifact creatures you control get +1/+1.

"Through The Cycle Of Rebirth And A Parting Gift, I Bring The Ultimate End With Transformation Of 'Clear Sky', I Deal The Ultimate Strike. That Which Can Cleave Even Dragons..."