The ShiftstonedEternal Power Calculator is a deck-building tool that visualizes your odds of drawing enough Influence and Power based specifically on the cards found in your deck.
As for thunderstrike dragons I could see it working fine to provide a lot of pressure and great value but I'm not totally convinced the deck needs that. I like daraka because its just more creature interaction and a big blocker. Most of the time its just going to eat a removal spell but thats a fine outcome and if it lives it will often just win the game for you. Hes a pretty great removal magnet, so much so that you can reliably play him to tie up the opponents turn because they often have to answer it immediately, which you can take advantage of to set up your next turn.(daraka on turn 6 or 7 to set up either Gift or Channel happens a lot). Let me know how thunderstrikes go if you try them out.
though I am tempted to try out thunderstrike dragons for the queensguard as they're also v exciting with dark return <3
As for thunderstrike dragons I could see it working fine to provide a lot of pressure and great value but I'm not totally convinced the deck needs that. I like daraka because its just more creature interaction and a big blocker. Most of the time its just going to eat a removal spell but thats a fine outcome and if it lives it will often just win the game for you. Hes a pretty great removal magnet, so much so that you can reliably play him to tie up the opponents turn because they often have to answer it immediately, which you can take advantage of to set up your next turn.(daraka on turn 6 or 7 to set up either Gift or Channel happens a lot). Let me know how thunderstrikes go if you try them out.