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)
Selvala, Heart of the Wilds The most important resources in Magic are mana and cards, so any card that gives you an advantage in both regards becomes quite strong
You can find the cards with errors but going to the app and scrolling down on certain erratad cards
The Corn Belt Card Show, Emerald Acres Sports Complex, 1201 Wooddell Way Mattoon IL 61938
PSA: There is a creature that costs sixteen mana in Magic When people think of the biggest creature in Magic , they always think of Emrakul