That first ability resembles the shenanigans you can get up to with Dargo, the Shipwrecker, so in the right deck, you can cast it for two mana, attack for seven (that can only be blocked by legendary creatures), and then sacrifice it to destroy an annoying artifact or creature
How many of you need that Commander for your deck to function well
Also, them having to aim their removal at this creature is good unless that removal says Target creature an opponent controls or they just block with this and the creature dies
It might get a little cheaper as time passes but not by much
Krenko, Mob Boss, Zada, Hedron Grinder, and a few others on this list are very popular commanders online, as goblins is one of the best supported types in all of MTG