From where I stand, its definitely Aragorn, King of Gondor
In contrast, the Historic banning of Temporal Manipulation is far from an anomaly, but instead its a deliberate pattern of bans for the format
Only one of your creatures may be a Ring-bearer at any given time, and they receive all the abilities that come from The Ring emblem
One in every eight play booster packs has a nonfoil version, with foil versions appearing less often
Heralds Horn is also a standout, given the high density of Tyranid creatures to be found in the deck
One cannot possibly lump all these decks together as one when discussing sideboarding plans, but I think that its more or less okay to do so when talking about strategic basics when discussing playing against this kind of deck