Firdoch core changeling
Firdoch Core is an artifact that has an activated ability to become an artifact creature. It has the changeling ability (all creature types). It fulfills the requirement of a card like unholy annex (if you control a demon, then…). If firdoch core has a (or all) creature type(s), then it must be a creature. How can a permanent have a creature type but not be a creature? Creature is the category that each of the creature types belongs to. Despite this, while firdoch core fulfills the “if you control a demon…” condition in both its untransformed (artifact) and transformed (artifact creature) modes, firdoch core is not a valid target of spells that say “target creature” when in not a creature (as you’d expect). Pick one. If it’s not a creature, it shouldn’t have a creature type i.e. changeling (all). If it is a creature regardless of its state, then it should be a valid target of spells that target creatures.
Mishanishiel#61898
shared this idea
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Rezzahan#77802
commented
There is the card type Kindred, which Firdoch Core has, and that allows noncreature cards to have creature types. Kindred is just the renamed Tribal card type, which has existed since the original Lorwyn.
205.3m Creatures and kindreds share their lists of subtypes; these subtypes are called creature
types.[...]308.2. Kindred subtypes are usually a single word long and are listed after a long dash: “Kindred
Enchantment — Merfolk.” The set of kindred subtypes is the same as the set of creature subtypes;
these subtypes are called creature types. Kindreds may have multiple subtypes. See rule 205.3m for
the complete list of creature types.