Bear in mind it's most likely going to be limited to a 1 draw unlike the special 5* gacha. Regardless, this is a player's best chance to grab a rainbow waifu, and who knows if there will be another deal like this.

I haven't gotten around to spending on Nutaku, but I know there's a 1000 Gold starter pack for a 50% discount at $5 (dunno if it's a one-time offer though); one would be able to save 50% on top of this epic deal (dang, I already sound like a rep from Nutaku LOL).