An Introduction to Premodern Ben introduces us to Premodern: A 1v1, 60-card format spanning from Fourth Edition through Scourge that recreates 1995 - 2003 Magic without Power Nine or original Duals
9.2 by 6.6 by 1cm Additional product info
(Its not a creature.) 4/3 Illustrated by TAPIOCA Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
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)
Certain decks, such as landfall decks or mana ramp decks, benefit from having a higher mana average since they will be able to afford beefier spells fairly early in the game