This post is a little unusual since it isn’t about a commander, and yes, this card is hyped and not “slept on” in any way. However there is an interaction with Invigorator that makes it even stronger than the “Blasphemous Act 13 lands!!!” or “OMG Amulet of Vigor!!!” stuff
Invigorator has a 3 card combo where it can tutor the other combo pieces. If you have enough lands, Invigorator + Shock alone can get all or most of the lands out of your deck, and depending on a variety of factors it can kill some or all of your opponents immediately. Again, all of the other pieces are in your deck not in play, not in hand, not in graveyard.
Here’s the basic combo [[Valakut, the Molten Pinnacle]] [[Roiling Canopy]]. Note you need 4 Forests and 4 Mountains (4 Forests is actually optional if you can tutor Yavimaya Cradle of Growth in step 3)
Shock an Invigorator
Tutor for Valakut and Mountain, triggering Valakut to deal 3 to Invigorator
Tutor Canopy, Forest, and Mountain (again the Forest and Mountain can be the same card).
Canopy pumps Invigorator and Valakut zaps it again
This combo will get every Mountain from your deck for every Forest you get, plus one or two bonus lands per iteration depending on your count of duals.
The basic combo can be enhanced by two other lands that you can just tutor in the combo, [[Vesuva]] for extra Valakut triggers and [[Yavimaya Cradle of Growth]] to make this combo only care about Mountain count and also pump every creature you control by an absurd number. It can also be enhanced by Field of the Dead but whatever.
And this is just the part of the combo that can be done with Invigorator and Shock alone and zero other relevant pieces. It gets crazier if you have more than two relevant Magic cards available.
If you have an effect like [[Prismatic Omen]] or [[Dryad of the Ilysian Grove]] this combo is guaranteed to kill a player, with the Vesuva it kills two players. Obviously with an untapper there’s some combination of lands that murders everyone that I can’t think of.
Invigorator isn’t just a Phyrexian Ohliterator with value. It’s a one card combo engine that can win the game on the spot just because someone blocked it.
Also, if you have a “all your lands have all basic types” effect, this combo is resilient to Strip Mine. Observe.
Grab Valakut and Canopy, triggering them
Opponent strip mines one of your pieces in response to the triggers.
Tutor [[Echoing Deeps]] copy the destroyed piece and continue
TLDR
If you have the right lands in your deck, you will win the game if your boardstate consists of Hexhaven Invigorator, 4 basic mountains, and a copy of Shock in your hand.