In case you were wondering, the final 35k point reward from the War Prime event is a universal EVO card. Getting that does entail burning through likely something north of 10 million troops, some of which could cost your 2 copper each if you don't have a ton saved up. But even if you call it paying something like 20 million copper for a universal EVO card, I'd say that's worth it, as UR generals are hard to evolve.

Of course, if you hadn't been doing the event at all and just found out now, it's probably too late.