With Oskar you can either force everyone to discard cards while being able to play your discarded cards, or you can benefit twice from loot and wheel effects
So, while these cards dont win games all on their own, they were too good at enabling combo decks in Modern
Since the play rate on draft is significantly lower and the win rate is a lot higher, this tells me that players attempting Mill with Archive Trap are better players, have a better idea of the Mill gameplan, and/or are being carried by Archive Trap
White Flare includes the Blazing Engine mechanic , which boosts attack damage based on the number of Energy discarded
The downside of this, of course, is that this takes quite a while to set up and requires an awful lot of energy