Gold Mine

Name: Gold Mine
Brand: Magic: The Gathering
Price: 0.39 USD

{T}: Add {C}.
Legacy — {T}, Mark one of Gold Mine's unmarked nodes: Add one mana of any color.
☐, ☐, ☐, ☐, ☐

Gold Mine has 2 printings, first in Mystery Booster Playtest Cards 2019 (2019). It has 3 official rulings.

Legality

2019-11-12: Nodes remain permanently marked on the physical card. They’re not removed as it becomes a new object or as the game ends.
2019-11-12: If an object with nodes becomes a copy of another object with nodes, the nodes on the physical card that’s the copy will be marked if the legacy abilities it gains instruct you to mark a node. Thus far, this ruling applies only to the case where one Gold Mine becomes a copy of another Gold Mine.
2019-11-12: If an object without nodes becomes a copy of an object with nodes, the copy has no nodes. A cost to mark one of its nodes can’t be paid.