I run Gifts Ungiven. I also run Intuition which is a much better Gifts. They're especially good in decks that use flashback spells, dredge and reanimation effects.
I cut Arc Trail, Arc Lightning and Flames of the Firebrand because they were too effective as removal against aggro decks. They often are 2-for-1s or even 3-for-1s against the aggro decks. I play an incredibly powered cube where aggro is already a hard sell among other insane unfair decks, so I try to give aggro the edge as much as possible.
I run Temple of Mystery and Temple of Epiphany for lack of better options (in my opinion) for my 5th land slot. They're the best colors for scry lands, sans UW and UB where I run the BFZ duals instead.
Keldon Marauders feels like one of those red two drops that has increased in power over time. There have been solid enablers released since to make it a better card. Examples: Fair options like Reckless Bushwhacker and Arlinn Kord, and less fair like Immediate Action.
Kolaghan's Command is one of those few cards that I will actively splash a third, or fourth, color for to include it in the deck. It has single-handedly swung games in my favor every time I have cast it.
Sadistic Hypnotist was my boy for the longest time. But with black getting so many insane cards lower on in the curve, I just have Sidisi and Shriekmaw in my 5-drop section these days.
I run it as well as Gather the Townsfolk. I recently have a lot of various tokens going on in the cube, coupled with life gain and a white weenie that benefits from "spells matters" cards.
I run it. But I also run a lot of lesser-run cards that help support it like Shuko, Signal Pest and Cranial Plating. It has also been fine as just a 1/1 flier. Colorless manlands are good.
I wish her flip +1 included haste, but that's a pretty minor complaint. Dropping her T3 into T4 Thragdad and T5 Primetime all hasted out +1/+1 would have been pretty rad.
Keldon Marauders feels like one of those red two drops that has increased in power over time. There have been solid enablers released since to make it a better card. Examples: Fair options like Reckless Bushwhacker and Arlinn Kord, and less fair like Immediate Action.