Nice cards, nice artwork
Beholder- Awesome. For the critics- just because an ability already exists doesn't mean it can't be re-used in new cards!
Bloom- I'd make it give one life AND one light- or maybe that could be the upgraded version.
Combustion- wouldn't a fire bolt be far superior in every situation?
Funeral- Good idea, the game needs more variety in creature control.
Kraken- Hmm... Starting hand of 5 Towers and 2 Krakens = WIN! (might be a bit overpowered, maybe 1 tower would be better)
Martyr- Awesome!
Rewind- Needs a new name as Terroking already said. Also- should only be one turn otherwise overpowered/abusable
Rock Golem- great idea.
Telekenesis- I wish there were cards like this already!
Teleportation- I'd half the cost as it's just a weak momentum. Otherwise more variety is always good!
Updraft- Could be useful. Not sure exactly what you mean though. What's a slight chance? And by returned does that mean per creature or all creatures? Would they still damage the you?
Voodoo- Most likely WAY OP. But would make a good creature swarm counter.