Forgeborn Oreads
Constellation as a damage engine lives or dies on how cheaply you can chain enchantments, and this nymph sits at the aggressive end of that spectrum: a fragile 4/2 body that pings any target whenever it or another enchantment you control enters. The body tells the strategic story. Two toughness is too low to survive the combat trades a four-mana red creature usually wants, so this is not really a beater; it is a repeatable pinger that fires whenever your board grows wider with permanents that count. The value of pairing constellation with a damage trigger is that it converts the deck's natural development into reach: each aura, each enchantment you were already going to play (this creature's own entrance included) becomes an extra point at a planeswalker, a creature, or a stalling opponent. That also cuts the other way. A red enchantments deck that stumbles leaves this as a glass-cannon attacker that dies to almost anything, including the kind of cheap removal a 4/2 invites; a deck that floods the board with enchantments turns it into a slow, inevitable burn drip that never needs to attack at all. The design lesson is that constellation is most dangerous on a body that wants nothing from combat: the trigger does the work, and the creature is just the delivery mechanism. Note the constraint that keeps it honest, though: only enchantments you control feed it, so opposing enchantment builds do not accidentally arm your engine for you.
