There is no other aspect outside of the logic of the suggestion in which to give an opinion on.
Game Balance, Creativity, Originality, Useablilty ect.
Whether it can inspire other, better ideas- since these are unlikely to be implemented in the game anyway.
Shrieker + Reverse Time --> Graboid
Logic: Yes
Balance: No
Original: No
Usable: At the cost of overpoweredness
Inspiring: Really?
I love the idea in general, but shrieker should be an exception for obvious reasons
Unless we are only judging on logic, and then it would be perfect.
Edit: Seems a bit of a negative post, I'll agree with the idea that AM + BH should be either a black hole or supernova, either one I am fine with, however, you would have to think on who it would effect (caster of the spell, or side which the creature is on). Since they are both spells, they are both balanced enough, and would require a two card combo, so it just makes sure you are always being attentive, and understanding of the game.
