They are very powerful
And while you may have noted their conspicuous absence from Murders at Karlov Manor, the ten Shocklands, ever a staple of our repeat visits to Ravnica, are present and accounted for here, with snazzy new borderless art to boot
More awkwardness
This gives you everything you need to set up and play a Lorcana game, so you can focus on learning the core rules before worrying about deck-building
It doesn't copy whether that creature is tapped or untapped, whether it has any counters on it or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on
Something like Sensei's Divining Top can make sure you draw instants and sorceries for your turn plus some kind of sacrifice outlet to use the demon each turn, and make room for a new one would go a long way too