As a rule of thumb, you should consider these when they have natural synergies with your commander
Also, don't forget that if you sign up for my mailing list via this page, you'll automatically receive these cards on an easy print sheet so you can cut them out and add them to your deck!
That's just the cherry on top
The end result is that rather than having 37 lands in my Commander decks, in a post-MDFC world, I generally have 3132 "real" (non-MDFC) lands, but thanks to the eight or nine MDFCs, the total number of lands in my decks actually increases to 40 or 41
She's already pricey at five mana, and gaining a significant storm count even with a bunch of cantrips will make her effectively a seven or eight-mana card at least
Hobgoblin, Mantled Marauder Rating: 5/10 Hobgoblin, Mantled Marauder is quite an aggressive creature that might not hit very hard if you play it on turn 2, but on subsequent turns it can deal quite a lot of damage