So the new FF starter kits…

So I was browsing through Amazon and saw the FF Starters kit. Boros Cloud equipment vs Dimir Sephiroth. My specific question if I am to blink Sephiroth do the -2/-2 stack? And are their better ways to destroy multiple of an opponents creatures to keep the counters?

So I was browsing through Amazon and saw the FF Starters kit. Boros Cloud equipment vs Dimir Sephiroth. My specific question if I am to blink Sephiroth do the -2/-2 stack? And are their better ways to destroy multiple of an opponents creatures to keep the counters?