It is good nearly any time you can cast it
If you remember nothing else from this section, remember this: artifact land does not mean artifact spell
Erratic Portal also fits the mold, but at a higher mana value
As announced in a roundup of October's secret lairs, he'll be getting his own six-card "drop" alongside fantasy artist Kieran Yanner, Iron Maiden, Jaws, and Furby
This gives you free reign to do whatever you like on your turn, with the only things you need to worry about being an instant-speed Planeswalker ability (like Teferi, Master of Time) or a land's ability (like a channelled Eiganjo, Seat of the Empire)
Terminal Velocity is a great use of six mana