gengar pokemon card first edition (13/165) Base Set Type The Most Iconic Gengar Cards

(They cost less to cast for each artifact you control.) +2: Tezzeret deals X damage to each opponent, where X is the number of artifacts you control

This is an immensely powerful effect, especially in a black control deck (be it Commander or otherwise) that cares about dealing with any threat your opponent might have in their hand, on the board, in the graveyard anywhere

The 'Let Your Power Shine' ability also lets you draw a card whenever you remove one or more damage from one of your characters

This makes it highly resilient and a deadly threat in the long game

Equipment is very mana-intensive, because you need the mana to cast them and more mana to actually put them on a creature