original koffing pokemon card 57/135 - Plasma Storm Common Card Type The rarest koffing card! :

It is a playable cube card but it isn't very efficient or effective which is not sufficiently compensated for by its cycling

Lita, Mechanical Engineer can untap these artifact creatures to act as blockers on your opponents turn

Classic artifact lands like Seat of the Synod or Great Furnace are also excellent because they come in untapped and fuel all your artifact synergies without costing you deck space

The advantage of Sage is cost but if that is what you are after then Nature's Claim, Degalmor or Naturalize should offer more utility

But if you have a base-set card in your card collection, there are a few visual indicators of its worth