The core and most important common unit of the Shadow Elves with a lot of uses.
The first very important use was already mentioned, Feint can be used to protect the summoner or another ranged unit after it attacks.
But Feint has more uses, it allows you to take spots after it kills a unit which is a very powerful ability and in general it allows you to reposition the True Seeker after attacking, which is also important to threaten future Shadow Knights, this combination proves essential for pushes and gate clogging strategies.
Its initial 3 strength is good enough for its 1 cost and while in theory the opponent can ignore the Seeker, they can be returned to hand, block spots, or threaten to work as Shadow Knight summoning points.
Use True Seekers a lot and then return them to your hand, they are very efficient for 1 cost.