Die-rolling was strictly Un-set territory at the time of release, but this could be printed as a black-border card now, and honestly seems like it'd be pretty good, with a one-third shot of missing and a two-thirds shot of being a 1-mana tutor for a relevant card
It has an interesting restriction on when it can be cast for free, but not nearly prohibitive enough to make this card bad
While the strategy is largely similar to the previous Simic deck, theres a bit more control in the mix
Of course, theres also one of the biggest surprises in Pokemon, when you beat the Champion and the entirety of Kanto opens up to explore again
(6/22/2015) Yes, if the fourth mode is the only one remaining, you must choose it
Stadium cards remain active until another Stadium card is played, shaping the battle over several turns