In the original comics, it is asserted that gods have ranks, and that the abilities of lower gods do not work on higher gods (Ra's Winged Dragon/Reaper Avatar), so if the same scene had been produced in the comics, it would have ended with Ra just chewing on the lightning bomb
The two black creatures pair well together because Dark Confidant reduces your life total, enabling Cecil to transform more quickly
Yeah, you can activate its ability and make it harder to block, but that costs a lot of mana and will often mean you cant play another relevant spell in the turn
Sometimes a player at the table is gearing up to stomp everyone down, and you need allies
Additionally, his threat of an emblem may offer him base protection as its unlikely your opponents will want to risk having him return, threatening another emblem
Not one, but all of the cards