You only really need to return it once to be worth it
On each player's turn they ready any cards that are exerted (turned sideways) and then draw a card
The ridiculous name is a reference to the flavor text of Granite Gargoyle, which references a quote from The Underworld Cookbook (the book Asmo summons) about gargoyles being delicious
Vaultborn Tyrant Vaultborn Tyrant is expensive, but its very hard to deal with effectively
If you are Commander Vimes, all you have to concentrate on is stopping these conditions happening, as if you reach the end of the draw pile with no one else winning, you've won
Five damage is enough to kill most creatures or planeswalkers on the board, so if I had any complaint about it, its that in an artifact deck with convoke, its going to be ridiculously easy to cast