Bloodseeker is a curry hero in Dota 2 that has an early power peak and good farming potential. The hero is very easy to use, due to its clear abilities, as well as its simple usage. He stands the line well, and is able to dominate it very strongly. He has both physical and magic damage, which will allow you to build your game more flexibly. I suggest going over it in a bit more detail, and break down all of its advantages.
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The character's first ability. It gives you or your allies extra attack speed and gradually takes away some of your health. It is good for speeding up your farming, as well as physical and magic damage of the person it is used on.
The hero casts a pentagram on the field that lasts for a certain amount of time and then closes, dealing magic damage and silence to all enemies inside. This ability can help you make kills on enemies, control Renge Creeps, and harass opponents.
A very strong passive ability that gives the hero a lot of advantages. When killing an enemy or a creep, the hero will restore a large amount of his HP. Also, if there is an enemy on the map with Low HP, it will speed up your movement speed up to the maximum. The ability stacks well with the purchase of Aghanim Shard.
Bloodsucker bleeds the enemy, causing them to take a large amount of net damage while on the move. Works well against mobile heroes, making them stand still.
Bloodseeker is very important to line up well, and continue to build his advantage further down the map. The builds on him are very situational. You can even hit full magic damage at times. Watch the builds and also think about the game situation and what items you might need.