Their trigger reads, Whenever a land enters the battlefield under your control, you may gain control of target creature for as long as you control Roil Elemental. So, basically, as long as you can keep Roil Elemental alive, you can absolutely steal every other Creature on the battlefield
Sources: PriceCharting (2), TCGPlayer (2), Ptcgradio/YouTube
Almost every new generation comes with one of these professor cards nowadays, but few of them make the splash that Juniper did
There are a lot of branches left out of her family tree even though shes a grandmother
Scratches are mostly important for Foil cards as the Foil surface is much more sensitive to scratches
PSA has graded nearly the same number of blue-backs (74) as green-backs (73) but has given out just 15 PSA 10 grades to the blue-backs versus 34 for the green-backs