Thalakos Sentry

Strip every ability off a shadow creature and this is what remains: a 1/2 that almost always connects, against an opponent with no shadow of their own to interpose. The keyword puts combat on a separate track, where shadow can only block or be blocked by shadow, so a non-shadow board offers nothing to stop it. The cost is structural rather than printed on the card: a creature locked into that track surrenders its ability to defend, leaving its controller open on the back swing. That two-way restriction is what separates the mechanic from flat unblockability and from later evasion like fear or intimidate, both of which let a creature still chump on defense. The Thalakos were blue's tribe within the shadow project, and the Sentry is the unadorned version of the bargain: a recurring point of damage with no rider attached. It also functions as the reference body its more elaborate kin were priced against; every Thalakos with an activated ability or a stapled effect was a calculation of how much extra to pay over this floor. As a piece of design it answers a simple question (what is bare shadow worth?) and the answer is exactly this much, a small evader whose only job is to keep hitting.