If you're going legacy, Tron is bad. It's too slow. 4 Eyes is so you have a better chance of having one early. If you are going legacy and are running
Eye of Ugin, run
Eldrazi Mimic. Because then if you start with any mimics and an Eye, the Mimics are free. Then you can turn 2 drop a city/tomb and drop a
Thought-knot seer and have your mimics become 4/4s.
If you're staying modern, Etron is good, but as noted, Eye is not legal. 4
Thought-knot seer, 4
reality smasher and 4
matter reshaper are the usual suspects for creatures, with a ulamog, the ceasless hunger. 3
all is dust is excessive, but you can run 2
karn liberated and an
ugin, the spirit dragon and get very good value out of them.