Tania the Thrallherd

When Tania the Thrallherd enters play, gain
control of target creature for as long as Tania the Thrallherd is in play.
{2}{g}{g}: Gain control of target creature for as long
as Tania the Thrallherd is in play.
At the beginning of your upkeep, create a green
1/1 Elf Thrall.