I like this card. It allows you to draw 2 cards, and then choose one card in your opponent's hand randomly and have them put it on the bottom of their deck. Granted, drawing only 2 cards hurts slightly as most people will prefer the draw power of Steven's or TV Reporter, but TG's Mars is certainly a viable alternative, especially if used in decks whose Pokemon also have hand-disrupting effects.
Modified - 8/10 (Solid alternative for TV Reporter and other cards)
Limited - 10/10 (Any form of card drawing is great here, and the ability to disrupt your opponent's hand makes it all the better)
Unlimited - 1/10 (Better forms of hand disruption and draw here)