I have always liked this card, though I traded all four of mine away for some weird reason, but I liked it for Multiplayer games. I mean everyone has to play a land, right? And life gaining is good in an MP game, right?
I nominate Budoka Pupil. The entire cycle of creatures that change from mortal to spirit when they acquire enough ki counters is very exciting to me. It was, in my opinion, the most creative application of the spiritcraft mechanic in the block. The creatures themselves are all good representations of their colour and the green one in particular is massively fun to play with.
Well, after a flurry of nominations from last Monday, this kinda petered out. So here's my nomination before voting:
Day of Destiny - It pumps up those Legendary creatures (and the main reason why I remember it is because there was a guy in my play group who always collected one of every Legend and kept trying to make a deck out of it. When he saw this, he traded quite nicely for it).
Ninja of the Deep Hours - Oversoul Ornate Kanzashi - Ransac Lifegift - Killer Joe Budoka Pupil - Ephraim Day of Destiny - Spiderman