Most of the expensive Eldrazi creatures do what can best be described as 'big, splashy stuff,' but they don't exactly synergize with one another in any meaningful way
You can also try to create synergies within your own deck, whether it be with Deaths Shadow as mentioned above, or my personal favourite in Legacy of casting it at your opponents end step and then cast an Uro, Titan of Natures Wrath a three-mana 6/6 creature
Duelist Alliance is available now, and Duelist Alliance Deluxe Edition is available starting on September 12
So here it is: Introducing, the LIGHT and DARK: Inspired by: @2477Rose Decklist Red-Eyes Darkness Metal Dragon x1 Judgment Dragon x3 Black Luster Soldier - Envoy of the Beginning x3 Chaos Emperor Dragon - Envoy of the End x3 Dark Armed Dragon x1 Gorz the Emissary of Darkness x2 Lightpulsar Dragon x3 Darkflare Dragon x1 Raiden, Hand of the Lightsworn x2 Lyla, Lightsworn Sorceress x2 Eclipse Wyvern x2 Debris Dragon x2 Phantom of Chaos x2 Lumina, Lightsworn Summoner x1 Minerva, Lightsworn Maiden x1 Card Trooper x1 Ghost Ogre & Snow Rabbit x2 D.D
They also feature a named ability