Green already has a lot of creatures that produce mana (Innistrad Remastered's Somberwald Sage is one that just didn't quite make the cut for this list), but what if all your creatures could produce mana
Jodah, the Unifier Jodah, the Unifier is one of the best incentives to play a 5-color EDH deck filled with legends
Making land drops every turn also means youre less likely to fold under pressure of light or even heavy stax pieces
It is a very odd mana rock, because you are spending mana to get 1 less than you spent, but I think the threat here is that it then also becomes an 8/8 that makes opponents start sacrificing permanents, which seems pretty strong, especially since it is safe from creature-based removal until you turn it on
Youre best off buying singles from here when you find good deals, and buying general sealed products elsewhere