It's far worse than Time Spiral, because Spiral you can use the mana you get back however you want instead of being limited to casting one card, and also you can further abuse the untapped lands with mana doublers like High Tide
The other clauses are good too
It won't enter the battlefield, nor will it cause any applicable abilities to trigger
While Quicksilver Elemental isnt the cheapest MTG card in existence, this combo definitely has some potential
Khans of Tarkir Block Sets: Khans of Tarkir September, 2014 Fate Reforged January, 2015 Dragons of Tarkir March, 2015 Setting/Flavor Tarkir is a world with loose Mongolian influences, scattered among the five warring factions of the plane
The best thing Golgari Midrange can do is play Wildgrowth Walker on Turn 2 into Jadelight Ranger on Turn 3, which won't happen very often with the Challenger Deck version thanks to having only two copies of Jadelight Ranger