Nasus

Hardly any champion captures the idea of infinite scaling quite like Nasus. Everything he does centers on Siphoning Strike: a point-and-click empowered attack that gains permanent power each time it finishes off a target. Every minion he kills with Q pushes him closer to single hits that dismantle towers or delete champions, so a top laner who sacrifices his early game on purpose ends up in a late game that opponents have to work hard to stop.

The remaining abilities exist to keep that farming going and to set up his carry window. Soul Eater gives him innate life steal, so he can stay healthy through poke and skirmishes while his stacks grow. Wither is among the most powerful single-target slows in the game, cutting both movement speed and attack speed of a duelist, which is a real problem for carries who depend on auto-attacks. Spirit Fire controls enemy movement around the wave, strips armor, and lets him clear minions fast when he needs to catch up or push.

Team contribution

Fury of the Sands turns Nasus into a furious juggernaut, granting bonus health, extended range, a damage aura, resistances, and a sharply lower Siphoning Strike cooldown. He becomes a frontline threat that the enemy team has to kite or burst down right away. In teamfights he usually chases a priority target, Withers them into irrelevance, and keeps pounding with stacked Qs.

The downsides are built into his design: he cannot move quickly, he is exposed to early aggression and kiting, and he relies on farm. Players who like patient, methodical macro play, accepting short-term pain in exchange for reliable late-game power, tend to find Nasus extremely rewarding.