Urza, Lord High Artificer | Worldwalker Helm | Artificer Class

Cards

At the beginning of your end step,
Artificer Class's third ability triggers, creating 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 3.