Obviously Tawnos, Urza's Apprentice + mana rocks + Paradox Engine is infinite mana, but saying "combos with Paradox Engine" is about as surprising as saying "this planeswalker is really good with Doubling Season!" There's more obscure combos out there though, such as pairing Tawnos with Sands of Time for infinite untaps / mana -- yes, Sands of Time is a real card that now has actual Commander potential
Double Masters While not the first reprints of full-art lands, these were highly anticipated
The effect of Aminatou's third ability lasts indefinitely
Centering and edge wear are common on this print, so high grades are scarcer than the raw population suggests
Courser of Kruphix adds another line of defense, giving you some lifegain here and there to ensure you live longer, and you can play lands from the top of your deck which is a strong source of card advantage and filtering
If you are concerned with box condition, photos of the box can be provided
