Worldwalker Helm is a mythic Artifact card from Magic: The Gathering (The Big Score, BIG). Current market price: $2.78.
Mythic
The Big Score (BIG)
{2}{U}
Mana Value
3
Colors
U
Card Text
If you would create one or more artifact tokens, instead create those tokens plus an additional Map token. (It's an artifact with "{1}, {T}, Sacrifice this token: Target creature you control explores. Activate only as a sorcery.")
{1}{U}, {T}: Create a token that's a copy of target artifact token you control.
