The rare hunter was Seeker, who used Exodia to steal Joey red eyes
http://yugioh.wikia.com/wiki/Seeker's_Decks
As for the card reviews, I don't really play Iswarms, but to my knowledge they focus on tributing similar to monarchs.
The cards I'm a bit iffy on are:
Infestation Revival: The card seems like a bit much, being able to continously cycle your cards, which, judging by some of the other, can make for some nasty plays that dominate the field
Infestation Immunity: Now, THIS is pretty broken, while dark hole and other destruct spell cards are going on, monster effects are more prevalent in today's game, and being immune to all monster effects is a cost free immunity
Goliath, the first Steelswarm: The guy seems pretty good, almost too good. After getting three tribjtes, this guy nukes the entire field.... except for himself, making it a more attractive Black Rose. Now, it can be hard to get three Swarms on the field, but with the ISwarm Scapegoat you have there, it wouldn't be too much of a problem considering it can be used on an opponents turn. It's a free nuke with a beater of 4000 atk, making it so it can basically 2 hit kill an opponent, and with its effect, it's going to. After clearing the entire field, there's not much most players can do against the second effect, sending one card to destroy all opponent cards of the same type is extremely broken. To put an example, I'll use one from Placidos deck, Superdimensional Robot Galaxy Destroyer, the card is hard to get out due to being a level ten three card XYZ, however, it's effect lets it nuke the opponents backrow, this is not as versatile as Goliath. For another example, Demise king of ar mag end on has a similar nuking effect, but he can be veilered, and takes some points to nuke. Not only that, but his 2400 attack pales with the 4000 attack of Goliath. Furthdrmkre, you can't prevent Goliath from nuking, no traps, spells, or monster effects can be activated to Counter his effect.
That concludes my review, I apologize for not knowing enough of the Iswarms to give a constructive review on your other cards. They all look fine to me, except for the ones I specified above.