Dazzle

Use Poison Touch only if you can follow up with few right-clicks on poisoned hero.

If an opponent is surrounded by allied units, you can Shadow Wave those units and deal huge damage.

Use Shadow Wave as Shallow Grave is about to expire to provide a burst of heal.

When in trouble, you can attempt to Shallow Grave yourself and teleport out.

Avoid showing yourself to opponents at the start of the fight. You are number 1 priority for them to kill.

Purchase Aghanim's Shard at 15 minute mark as it provides extra control and kills off basic illusions.

Use Bad Juju twice to reset the cooldown of Shallow Grave every time post level 12.

Avoid being hit by enemy heroes while under effect of Dazzle's Poison Touch.

Shadow Wave does a lot of damage if you are surrounded by enemy units.

Someone buy a Spirit Vessel to offset healing from Dazzle and to finish off the Shallow Graved hero.

Look to focus Dazzle in teamfights as he is squishy but provides a lot of sustain if left unchecked.

Buy gap closing items to get on top of Dazzle.