Cards like these, that let you play as many copies as you want in a deck, are often worth a couple bucks even when printed at common or uncommon
It does require some support to optimally use such as a Sensei's Divining Top however it is still fine hard cast as a six mana sorcery, it will still do more than Wrath of God would in that it gets round persist, undying, Wurmcoil Engine, Bloodghast etc
But you can see where they were going with stuff like the Unearth mechanic
While four of these are exclusive to Collector boosters in the vivid Neon Ink foiling treatment (Aang, Zuko, Katara, and Toph for Air, Fire, Water, and Earthbending respectively), five more neon-less ones can also be found in Play boosters
2000 $150$200 The hype ramps up further
If the copied creature is a token, the new token that's created copies the original characteristics of that token as stated by the effect that created the token