Figuring out what card is least needed has a little bit of play, but not too much
While free counterspells normally favor explosive, all-in strategies, the designers made a prescient decision that Force could only be cast for zero mana during an opponents turn
In many ways it is the opposite to Sphinx's Revelation, instead of paying mana and gaining life you lose life and pay no mana
Chart a Course Chart a Course is at its best in aggressive decks capable of making it a 2-mana Divination, but its perfectly fine in any strategy that can utilize the graveyard
This means that the only types that are truly missing are Bug, Ghost, Ground, Flying, Ice, Poison, and Rock
Plus, his enters-the-battlefield ability can hurt your ability to stop him from flipping