Mirror of the Forebears

The two-mana price buys a colorless changeling-in-waiting: an artifact that locks in a creature type as it enters, then rents its way into being any copy of that type you control for a single mana per turn. What separates it from the pile of clone effects is where the copy points and how cheaply it repeats. The copy is not a one-time flash; it is a repeatable activation, so the same body can wear a different face turn after turn while the artifact-ness rides along on top of whatever it becomes. That artifact rider is the quiet upside: the copy keeps every type of its target but gains artifact, which turns type-matters synergies and artifact-matters synergies into the same trigger. The constraint that keeps this honest is the locked type choice on entry and the strict "creature you control of the chosen type" targeting: it is a payoff for a board already committed to a tribe, not an open-ended imitator. The effect ends each turn, so it is a mana sink that rebuilds its board presence rather than banking a permanent transformation. It sits in the lineage of cheap colorless copy tools that let any deck splash a clone, but where most of those charge full price once, this one charges a trickle and never stops offering the deal, which is the whole reason a tribal deck bothers to run a colorless artifact that does nothing until the type on the board arrives.