These kinds of cycles are important (if highly situational) for flavour and gameplay, but all I can really comment is the art -- I do like the elaborate 'real beetle' art of Black Scarab and the much fancier Blue Scarab
Trostani is going to love Blossoming Bogbeast, and Ezzaroot Channeler is basically Rakdos, Lord of Riots without even having to go to combat
The order of targets being declared is a similar order to how they go onto the stack, so your opponent will know the targets of your spells before they make their decision
The vigilance and third act are all but wasted if this is purely a defensive card
The second is imprinting something extremely repetitive, such as a board sweeper, so that the game cannot move forward
Sephiroth is a big, bad villain in the Final Fantasy universe