Your opponent wont have as much information as you have, and they tend to assume that youd put your artifacts in play as soon as you draw them, so if they only count seven poison damage via Ravager and Inkmoth and tap out assuming theyre safe, you can surprise them by going Darksteel Citadel, Springleaf Drum, Ornithopter to make it ten
Thanks to reddit user DizzyDrone, there is an English translation for this card: "Every time you cast a Eldrazi creature spell with a converted mana cost higher then or equal to 7, draw two cards." Eldritch Moon Spoilers - June 29, 2016 Greetings, TechRaptor readers and fellow Magic: The Gathering fans
Although this only does that once (under normal circumstances) it still taps for one mana the rest of the time which makes it fine
Their strategy might have one large flaw or there are simply better commanders out there
The one nice thing about them is the ability to play a little lighter on lands and still consistently make land drops