Karn, Gilded Guardian

At WUBRG it is only a 5/5 unless colored artifacts are already in play; unlike 52-point Sunderflock, no supported shell makes its draw payoff reliable.

Could be wrong if Revealed colored-artifact density or unusually strong five-color fixing could make a two-to-four-card ETB routine.

Five-color casting and colored-artifact setup leave Karn below 52-point Valgavoth; no supplied Pioneer artifact shell establishes a reason to test it.

Could be wrong if A new artifact package with multicolored permanents and reliable mana could turn Karn into a fringe reanimation or ramp payoff.

Instant Reanimator can bypass the cost, but a 5/5 with often-zero ETB return is far behind 72-point Ulamog as a payoff.

Could be wrong if A reanimation list already using several multicolored artifacts could convert Karn's ETB into enough cards to justify a singleton.

Even cheap reanimation does not solve the colored-artifact requirement; Karn lacks the reliable immediate impact of 60-point Ulamog.

Could be wrong if An artifact-heavy fast-mana or reanimation shell with multicolored permanents could make the card-draw ceiling relevant.

In five-color artifact blink shells, a multicolored artifact can let Karn draw several cards; otherwise it is merely a costly 5/5, narrower than Void Winnower.

Could be wrong if The score depends heavily on how many efficient multicolored artifacts a matching deck can play without weakening its core plan.

With WUBRG, vigilance/trample 5/5 is strong and colored artifacts may add cards, but unknown fixing often leaves it costing six to ten mana.

Could be wrong if A dedicated five-color fixing archetype or plentiful colored artifacts would substantially improve both castability and its ETB.