Those proportions are the backbone of nearly every consistent EDH deck - enough lands to avoid mana screw, enough ramp and draw to keep the game moving, enough interaction to survive, and a real plan to win
The EDH crowd will love Sorin, too
Of course, they could exert for other reasons and avoid having to challenge, but if you can get something big enough of your own exerted, your opponents characters will crash against it and take themselves out
Legality depends on the tournament format -- Clue Token can be legal in some formats and banned or restricted in others
I think Ajani wins the -7 ability contest because I imagine the number of games where blowing up all of your opponents land changes the outcome of the game to be higher than the number of games where taking 5d2-5 turns changes the outcome
The Chocobo Bundle contains 10 Play Boosters and so much more