It's perfectly fine to buff a Goring Warplow or Krosan Colossus with your first copy, and then reuse the ETB effect of Wall of Omens or Burglar Rat with the second
The copied artifact stays in play, even if the original goes to the graveyard, which means a player can use it to get some pretty powerful artifacts on their side and gain the upper hand against more seasoned players with stronger decks
This is on my short list of top sleeper cards
Balthier and Fran Rarity: Rare TYPE: Legendary Creature SUBTYPE: Human Rabbit CMC: 3 Mana cost: USD: $1.25 EUR: 1.00 TIX: 0.02 EDHREC RANK: 15073 (4/3) Reach Vehicles you control get +1/+1 and have vigilance and reach
Id say you want this green instant to be consistently cheap, occasionally free for it to be worth playing
Creatures in MTG are described by their type and subtype whenever possible, so youll see a lot of creatures that are human warriors, human artificers, and human rogues, but very few that are rogues, warriors, and artificers with no other creature types