With that much effort put in, most players are looking to get more out of it than a 6/6 flample that might or might not remove something
Every set brings new and powerful enchantments and artifacts, so simple solutions like this that include the Witch-Blessed Meadow side make it much easier to slot in a useful card with minimal impact to your mana sources
Still, if you ever sit down against a mono-colored deck with many basics, you have an easy way to tip the balance heavily in your favor
It doesn't copy whether that permanent is tapped or untapped, whether that permanent has any counters on it or any Auras and/or Equipment attached to it, and it doesn't copy any non-copy effects that have changed that permanent's power, toughness, types, color, abilities, or so on
(And dont forget key artifact creatures like Stuffy Doll and Snow Fortress as well)
I really appreciate that its more than goblin spam and lends itself to some unique brews