Very High Damage Techies Combo with Eul's
All of Techies's abilities do a ton of damage, but require a lot of set up. However, with just a Eul's Scepter of Divinity, Techies's can land a combo dealing a ton of magic damage and can help you get solo kills in the game.
Start with using Blast Off from the fog onto an unsuspecting enemy, and then immediately plant a red Land Mine. Because there is quite an activation time with the Land Mine, you must then Euls the enemy. In the cyclone duration, throw down a green Remote Mine. When the enemy comes down from the cyclone, he will be taking magic damage from both the Land and Remote mines. In the end, you will be damaging an enemy with Blast Off, Land Mine, and Remote Mine magic damage.
Beastmaster can still Interrupt Channeling with Primar Roar even if the Enemy has Linken's Sphere and BKB
A lesser known feature about Beastmaster's Primal Roar is that it has a knockback AOE to nearby targets of the roared enemy. Here's a clear example of this. This knockback actually interrupts all channeling, even through BKB. So next time an enemy decides to TP in front of your face because he thinks he's smart with his Linken's Sphere, know that you can just Primar Roar a nearby creep (if there is one) to cancel the TP.
Phoenix Sunray TP Out
There is an easy escape with Phoenix that lets you safely teleport away from danger. Find an edge of the map, and use Sunray toward it. Move forward with the Sunray at the edge of the map and then TP out. You will continue to move forward off the map while safely finishing your teleport.
Easy Courier Snipe at the Start of the Game
In higher level MMR (4k+), the midlaner almost always uses the courier after getting the bounty rune to deliver a healing salve or another cheap item. There are two heroes that can easily snipe the courier before it even leaves the base. Nature's Prophet can buy a smoke and teleport near the enemy fountain at around 3-4 seconds before the game starts. You can even walk in the fountain to see the enemy's courier. Just hit the courier twice when it leaves the fountain. Here's a famous example of Bone7 sniping the courier at TI5:
Monkey King can also do the same thing by getting to the fountain by jumping through the trees. Smoke yourself near the fountain and wait patiently as the clueless enemy use the courier.