This is the new star of commander format that has a very strong ability. It's a bit too expensive for standard or modern at 5 Mana, and the effect is too controversial. Tergrid a bit of a gamble at this point.
The initial market price is quite high for a simple rare, but people seem to love the showcase art, especially foil one that goes for around $30 each. These can sustain their value thanks to commander players.
But other than that the regular art card should settle at around $5, which is a perfectly good price for this kind of concept.