Darnit, Rukia, now I got addicted to making cards again.
I know these are not even remotely balanced, but mana balancing is something I leave to those who are more actively familiar with MtG, so these mana costs are
TEMPORARY. However, I wanted to share these ideas I have:
BTW, this doesn't mean that this creature can't be destroyed, it just can't be destroyed while it's ATTACKING. Hope that's clear enough.