And notice that the only once each turn restriction means you can trigger it on your opponents' turns.Terrasymbiosis plays particularly well with earthbend, and it's often played in the 99 when Toph, the First Metalbender is in the command zone
It's not an evergreen mechanic, and unlikely to become one any time soon
Pauper decks are well served with these cards, and burn is a well-established top-tier deck in the format
It may not be the most reliable of the two for ones, not even always the best value of two for ones, but it is often enough and when it is it does tend to end the game
I can see this as another card from the latest set that will continue to rise in value over the next few weeks
What could be better than to sit behind a defensive creature like Oscorp Research Team and to leave the mana open to draw two cards each turn