Whether that player decides to sacrifice a ward creature to Diabolic Edict is up to them, but the ward ability will not apply
There's only one "chase" mythic in Nicol Bolas, God-Pharaoh, and calling the new planeswalker "chase" is using the term lightly: $15.72 isn't quite the same as some past chase mythics in the $30 to $50 range
It preserves their value and ensures their longevity
Enter Euclase: a combo god that lets you knock out any Pokemon with exactly six damage counters on it
Even 1 damage dealt to a creature from a source with deathtouch is considered lethal damage, so any amount greater than that will cause excess damage to be dealt, even if the total amount of damage isn't greater than the opponent's creature's toughness
If you have a particular aversion to counterspells, you could even run cards like Destiny Spinner