After having one casted for zero you will have 3 remaining in your deck that you can only cast for [1G]. Especially, then this card is probably not something you want to draw on any turn ≥ 3.
This card is insane... Feasible in any aggro deck there is. Will be played in Neobrand as well as Tron and can be played in Jund, The Rock, and any variation of zoo decks. Might become the "Force of Negation" in terms of Price fluctuation of the current set.