A VP token could be nice in a future expansion... but not yet. Only the four +1s (action, buy, $, card) , both -1s ($, card), journey, estate, -$2 and trashing. Well, we have enough fun tokens, and it's not hard playtesting events ? ^^
Cantripifier : all in all, the reverse cantrip chosen by opponent would mostly be bad. If you don't allow exclude any, he will name a bad terminal card, say Workshop, or he even may name chapel and you won't buy cantrips for $2, nor spend $5 (I'd have set it to $4) to make your starting chapel a cantrip (or maybe yes ?...). Paradoxally, it it would Scout into a pseudo apothecary/village. If you allow exclude any, it can be good, but depending to the quality of cards and the number of excludable cards, it can be terrible (if you can't block all the "bad" cards) or broken.
The "cheap pathfinding" version could be good, but I'd change it to actions to remove the terminalness of some cards.
Here's my point.
Out of topic : I just thought something horrible while rereading events... Alms ! It can turn 5/2 openings into 5/4 openings !!!
http://wiki.dominionstrategy.com/index.php/AlmsNow, does someone wanna suggest an overpayable event ?