I am glad you want to try my suggestion.
I could image that 'give your opponents extra lands' and prison-like effects are a rough combination...
In fact they get the lands as a gift to pay for your taxes.
The lategame-veteran explorer is not a good one, yeah :|
But I hope it will serve you well - in a quick math the
veteran explorer is a cheaper
new frontiers for X=2, so cmc 3...
Maybe it will be stronger in the early game and much less useful in the late game, but I am sure at this point in the
game you have enough resolved effects to bring lands onto the battlefield.
Let me know if the veteran served you well.