Other creatures you control get +1/+1 for each Aura and Equipment attached to Heavenly Blademaster
Someone famously attempted to sell a copy on eBay for $1.7 million, but no one purchased it at that time
My name is still Gattison, I still maintain the Obscure List of Obscure Lists, I still write theme songs for Magic decks, and I still like puns too much
Lord of the Nazgl and Grma, Saruman's Footman both give some nice support to the spellslinging theme
While it's a fine card and scales throughout the game, there are a ton of graveyard-centric / reanimation decks in Commander, and it seems unlikely that Gyrus, Waker of Corpses will beat out most of the pre-existing options outside of something like Jund Hydra tribal (and then, it's not even that good with many Hydras since they are X-creatures, which won't work with the reanimation ability)
Impending: Cards with impending can be cast for a reduced cost and enter the battlefield with time counters