Losheel, Clockwork Scholar 
Legendary Creature — Elephant Artificer
Prevent all combat damage that would be dealt to attacking artifact creatures you control. Whenever one or more artifact creatures you control enter, draw a card. This ability triggers only once each turn.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL