Hero card

Worldwalker Helm

Artifact

SpellUsed once: what it does depends on when you cast it

Needs: Tokens

Gives: Artifacts

Not in winning lists yet: read from the card text and the graph

Build a deck with Worldwalker Helm as the hero

Makes it work

Simulacrum Synthesizer · Haunt the Network · Krenko, Baron of Tin Street · Aatchik, Emerald Radian · Pia, Determined Rebuilder · Pestbrood Sloth · Tolls of War · Sultai Monument

Benefits from it

Mendicant Core, Guidelight · Emissary Escort · Radiant Lotus · Memory Guardian · Voyager Quickwelder

Use instead if you don't have it

Simulacrum Synthesizer · Essence Anchor · Fire Nation Warship · Pinnacle Starcage · Mirrormind Crown · Esoteric Duplicator

Cards in the meta that answer it

Countersculpt (Azorius Control) · Inevitable Defeat (4-Color Control) · No More Lies (Azorius Control) · We Say Thee Nay! (Dimir Aggro)