Then the equipped dork has first strike and Lure if it's attacked
In Commander, it's absurd: you get four free spells, basically guaranteeing that you'll hit something good
While for some decks, the graveyard represents cards that have been used or destroyed, for graveyard-focused decks, this zone is capable of functioning as something comparable to a player's second hand
This is also the deck that Id move Tectonic Hellion into, since it will likely want the help, which suggests even more unblockableness, like Sun Quan, Lord of Wu
The minus ability is effectively Abrupt Decay, an ability that Standard decks will be happy to pay four mana for if it leaves behind a planeswalker
Being Tanglespan Bridgeworks when you're not in a position to fight is a huge buyout for this type of effect