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My go-to Eldrazi is Pathrazer of Ulamog as it has built in evasion, hits hard and A-3. Bane of Bala Ged is a good fallback/redundancy.
Otherwise:
Creatures with battle cry, myriad, dethrone, that new blue commander creature that makes opponents creatures 1/1s,
Blue is the color of flying, so you have access to Levitation and Archetype of Imagination
Red is also the color of “cannot block” abilities like Tectonic Rift and Bedlam.