Between greens great ramp auras and blues removal suite of auras, you have a solid basis of answers that will trigger Eutropia and get you rolling
One- and two-drops and lots of burn is important in these decks, but also fairly interchangeable
(You gain card advantage each time a spell you control resolves and you end up having more cards relative to your opponents than before that spell resolved
Official Wizards of the Coast tournament rules require authentic cards, so you cannot use a printed proxy at a Friday Night Magic event, a competitive REL tournament, or any sanctioned competition
That gives Vivi +4/+2, and you get to add 4 mana in any combination of blue and red
The first color that called out to me to use as a base for an Eldrazi aggro deck is black: Creatures (28) 4 Bloodsoaked Champion 4 Hangarback Walker 4 Reality Smasher 4 Thought-Knot Seer 4 Bearer of Silence 4 Reaver Drone 4 Matter Reshaper Lands (25) Spells (7) The most compelling black Eldrazi is Bearer of Silence because of the blend of power and versatility it brings