Purge's Guide to Mid Tusk
Tuskar is a fairly tanky mid hero whose skillset is designed for solo killing heroes and disrupting teamfights.
Try to trade advantageously with your opponent in mid while last hitting by using ice shards to trap your opponent with your creeps, and snowball dodging their nukes.
Once you hit mid game, go around solo killing supports with your nukes and ulti, and transition into damage and teamfight items!
Go check out my YouTube for videos and tips - PurgeGamers