Enchantress + Lifestealer

Why this works

Putting pressure across the map often relies on converting early lane advantages into kills. Enchantress can grab a powerful neutral creep with Enchant, and Lifestealer can then use Infest to hide inside it. This turns the creep into a Trojan horse. Enchantress can walk the unit into the enemy jungle or up to a lane, use the creep's ability like a stun or net, and then Lifestealer can pop out with Rage to secure a kill on a surprised target. It’s a decent way to deliver Lifestealer directly onto an enemy backliner without him having to burn his own resources closing the distance.

The effectiveness of this trick depends heavily on timing and execution. An enemy team will get suspicious of a lone, high-value creep marching at them and can often kill it before Lifestealer can make his move, leaving him stranded. The coordination needs to be good. While a successful gank can snowball a lane, a failed attempt wastes a lot of time and can feed the enemy a big creep bounty and potentially a hero kill. The risk and reward are fairly balanced, so the duo doesn't consistently create a huge advantage over the course of a game.