The real trick is building around it effectively
Positive impact, even speaking as someone who got combod out by a Mizzix player twice in one night
The Vengevine archetype could also support this, if it turns out to be as good as it looks
While, at first, this effect may seem underwhelming, the fact that this effect uses a land slot is hugely important
Players suddenly have the ability to generate treasures out of thin air with almost every card in their deck, letting a true treasure deck finally announce itself
This is either the "horizontal sheen" pattern used for standard holos or the Pokemon ex pattern with both a "slanted sheen" and "starry overlay." Right now, it's unclear when TPCi will use galaxy holofoil over regular holofoil