Non-red decks have plenty of answers too
Every single deck you ever play against will immediately try and take out your eldrazi, and without spellskite your chances will drop tremendously
The reality is that casting this card straight up isnt realistic in a Constructed setting
Artifact Tokens (CTRL to add secondary) Tutor Tutor (CTRL to add secondary) Untap Untap (CTRL to add secondary) Maybeboard Uthros Research Craft Station (Tap another creature you control: Put charge counters equal to its power on this Spacecraft
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
(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