Forum:Protection/destruction combos

Okay I've got some pretty interesting ideas for card effects but I need to know if they will work.

Alright I've got a Number 107 Galaxy-Eyes Tachyon Dragon on my field and when I enter my battle phase I use his effect. Now I attack my opponents face down monster and it's a Gogogo golem. It can't be destroyed if in defense mode once per turn. Is this an effects activation and can I attack his gogogo monster again via Tachyon Dragon's effect.

Next, I summon my Tachyon dragon and my opponent uses bottomless trap hole. I then activate the spell card Burial from a Different Dimension targeting my Tachyon Dragon. Can I then activate the quickplay spell Xyz Double Back?--68.80.142.179 (talk) 05:12, June 10, 2013 (UTC)