Tanuki Transplanter (NEC) from Neon Dynasty Commander, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Oleksandr Kozachenko
• Card Text:
  Whenever Tanuki Transplanter or equipped creature attacks, add an amount of G equal to its power. Until end of turn, you don't lose this mana as step and phases end.
  Reconfigure 3 (3: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)