Spell Pierce hits cards of any mana value and Flusterstorm is the best way to win a big stack battle thanks to storm, but Minor Misstep has some upsides too: it's a hard counter, so unlike Spell Pierce you don't have to worry about your opponent paying for it in the late game and resolving their spell and it can hit creatures along with spells, which is huge in a world where Ragavan, Nimble Pilferer is in one-third of decks
At the beginning of your upkeep, you lose 3 life., Sacrifice this creature: Each other player draws a card
Call to the Grave, Barter in Blood, and Grave Pact are all excellent at this, and they all fuel the main man himself
Impolite Entrance is another great cantrip in the genre of one mana cantrips, and Lasting Tarfire can wrack up some serious damage in the right deck
Especially if you combine it with cards that cheat big creatures into play
Just remember, the card will only be available in a physical copy of the game, so buying digital isn't gonna cut it