||
|New Rating system (RIP Greven)|
Power | Flexibility | Synergy
3.0 - Total Bomb | 3.0 - Effectively Colorless | 3.0 - Best with others
2.0 - Play this card if you can | 2.0 - Splashable, 3 color | 2.0 - Better with some decks
1.0 - Filler | 1.0 - Playable in 2 color without problem | 1.0 - No special interactions
0.0 - Unplayable | 0.0- Needs 10+ colored sources | 0.0 - Sideboard

This is pretty solid, and it's worth about ~1/2 a box right now, so you aren't passing it if you are keeping the cards.
2.5/1.0/2.0. Obviously the walker side is better if you have stuff to flashback, and the ultimate is good for milling.