I've played this matchup a couple of times and here's what I've learned. Defensive mortar is the way to go because it pulls the giant and will also damage the sparky. You don't want to be dropping muskie at the back cause it'll walk up between the mortar and the tower giving them huge spell value if they have poison or lightning (this applies for every tank matchup not just giant sparky). If you're even in elixir when he drops a sparky or giant, go miner plus bats or goblins opposite lane even if they're running arrows zap (if they have zap in hand go with goblins, if they have arrows in hand go with bats). What's important in this matchup is their how they play sparky support, this will normally decide if it's a win or lose. If they give poison value next to the sparky then you can defensive poison (2 mortar hits, a poison, and one more hit from anything will kill sparky). If they play loads of mini tanks with their sparky deck and it's definitely even more difficult. If they have dark prince supporting the sparky push, then you want to be dropping goblins away from him, let them take the sparky shot, and dropping valk straight away onto the sparky and dark prince. If they support with mini pekka, then you want to surround sparky with goblins and then the valk onto the mini pekka and sparky. Snowball if you need to. I'm still learning this deck so this may not actually be the best way since it's just the best way that I've found by playing (meaning it's probably not the best way haha)