Urza, Lord High Artificer | Worldwalker Helm | Mirrorworks

Cards

Cast
Worldwalker Helm by paying ({2} magic symbol) ({U} magic symbol) .
When
Worldwalker Helm enters the battlefield,
Mirrorworks triggers, causing you to pay ({2} magic symbol) to create a token copy of
Worldwalker Helm and a Map token.
Activate
Urza's first ability by tapping a Worldwaker Helm and a Map, adding ({U} magic symbol) ({U} magic symbol) .
Activate a
Worldwalker Helm by paying ({1} magic symbol) ({U} magic symbol) and tapping it, creating a token copy of the
Worldwalker Helm token and two Map tokens.
Activate
Urza's first ability twice by tapping the Maps, adding ({U} magic symbol) ({U} magic symbol) .
Repeat from step 4.