Wraith King + Tiny

Why this works

Taking objectives ahead of schedule is the core strength here. The duo is excellent at converting a single kill into a tower, letting them control the pace of the game. Tiny provides the initiation with his Avalanche and Toss combo, which is more than enough time for Wraith King to walk in, land a Wraithfire Blast, and secure the kill with right-clicks. Once a hero is down, Wraith King can summon his skeletons while Tiny grabs a tree, and they will tear through a building before the enemy can properly respond.

This forces opponents to play reactively from the early midgame. They can't show in lanes alone without risking getting blown up by the combo. Teamfights are also complicated for them; committing everything to kill Wraith King first is the obvious play, but his Reincarnation means he comes back to a fight where the enemy has likely used its biggest spells. This leaves a full-health Tiny free to find a new target. The enemy's best bet is to try and kite them or split the map, because a direct five-on-five can easily go wrong if they can't handle Wraith King twice.