Piracy Charm
What a single blue mana buys here is three small problems compressed into one card, and the design lesson is in how unrelated they are. Islandwalk turns an attacker unblockable against a blue-heavy board, the +2/-1 either pumps a creature for the swing or quietly executes an X/1, and the discard strips a hand. None of these is dramatic on its own; the value is that you draw one card and choose the relevant mode at instant speed, after you see what the turn demands. That is the charm cycle's whole conceit: a cheap spell that refuses to be dead. The first mode is an evasion enabler, the second is half combat trick and half spot-removal for small bodies, the third is disruption, and the same piece of cardboard sits in your hand covering all three contingencies until you commit. The +2/-1 is the mode that ages best, because it answers the one-toughness creatures that recur across every era of the game while doubling as a finisher when a blocker has cleared. Charms like this are a study in efficiency through optionality: you pay nothing extra for the flexibility because each individual mode is deliberately modest, and the floor of "always something useful" is exactly what one mana is supposed to guarantee.
