In the case of Affinity, having another free artifact may actually make you more explosive, so its definitely the card I would choose for my sideboard
Character Super Rare (CSR) Premium full art cards showing a Pokemon V or VMAX with its Trainer
Skyshroud Claim Anything that goes for Nature's Lore goes double for Skyshroud Claim
It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or Auras or Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on
Ephara : i really, really think you underestimate the power of this thing currently
Chulane has accumulated a lot of hate in the Commander community, so follow the same rule as Edgewall Innkeeper when playing it