The value of X is calculated only once, as Glister Bairn's ability resolves
Aspect of Mongoose Avatar Destiny Brilliant Halo Cessation Corrupted Zendikon Crusher Zendikon Despondency Eye of Nidhogg Fallen Ideal Fiery Mantle Fool's Demise Fortitude Giant Inheritance Glistening Oil Guardian Zendikon Launch Necromancer's Magemark Puppet Master Rancor Skyblade's Boon Sleeper's Guile Slow Motion Sluggishness Spirit Loop Spreading Algae Squee's Embrace Tezzeret's Touch Undying Rage Vastwood Zendikon Wind Zendikon
While everything within the card is in color (black creates zombie tokens, green is primary in must be blocked if able, both colors can grant indestructible, and every color can care about equipment), powering up while equipped is almost exclusively seen in red/white
Its ability leans heavily on you sacrificing permanents, and there are plenty of artifacts that sacrifice themselves to be activated
Maybe adding some wings, or some extra elbows somewhere
This becomes super effective when paired with wide typal cards like Goblin Rabblemaster