It's a card that supports the strength of rocks, and it's an excellent card that can be expected to play an active role outside of rocks
Unless you are able to use one of the 3 Effects that can Move Counters ("Spell Force Implosion" Destroys the Card to do so), or use "Collector of the Spell Force" to clear these Counters, they are more of a wasted potential, and stand a solid chance at Bricking you, since those Cards' ATKs aren't much to write home about
Tournament Pack boosters always reprint powerful tournament staples to help you build your Decks, as well as foil upgrades of popular cards
Heralds of Tzeentch Theres nothing particularly wrong with Heralds of Tzeentch
Be sure you have at least a reason or two to spring for a fetch land, otherwise, it's worth it to save some money and leave the big spending for decks that need more from their land base
Persistent Petitioners is a creature that allows you to pay one mana and tap it to have a player mill the top card of their library