(It cant be blocked except by artifact creatures and/or black creatures.) When a creature with mana value 6 or greater enters, you may return this card from your graveyard to the battlefield attached to that creature
Non-red decks have plenty of answers too
Le Conte adds that many planets are surrounded by large numbers of moons: "Planets often have many moons (the Earth is special in having just one), such as Jupiter having 97 confirmed at the moment
Every single deck you ever play against will immediately try and take out your eldrazi, and without spellskite your chances will drop tremendously
Its also really easy to break, as all you need is two creatures that can flicker each other, which not only produces infinite +1/+1 counters on your creatures, but also scales firebending up to make infinite mana when Zuko attacks
The reality is that casting this card straight up isnt realistic in a Constructed setting