Banisher Priest and many other cards do that, but its the other abilities that make this card mostly superior to those
Tovolar has card draw attached to it, has a way to auto-transform your board, and a way to push damage through when he transforms
That said, I accept that as MTG grows, the designers need to continuously change things and explore new spaces
Deconstructing The Soul Stone At first glance, The Soul Stone might look like a simple mana rock with a very expensive ability
Green has ways to untap Pippin on other turns, allowing you to make four Food and four Soldiers on a trip around the table
When you exile a card this way, target creature you control gets +X/+0 until end of turn, where X is that card's mana value