One of the big early moments in playing Magic is making this realization about when it is most efficient to cast your instants or use your activated abilities
And this extremely high average cost is actually a conservative number because there's a four-way tie for 12th most played deck, with Izzet Blitz, Urza's Kitchen, Scapeshift, and Amulet Titan all coming in at 1.8% of the meta
If you find yourself facing down a board full of threats, Damn can be cast for its alternative cost and turned into a Wrath of God, sweeping the battlefield clear for you to progress your game plan
This Baldurs Gate card helps to enter the Undercity and frees up one of your clerics, rogues, warriors, or wizards for a nice free attack
First editions or shadowless with stamps
One of my favorite archetypes that Wizards has given lots of love over the past couple of years is cast-from-exile decks