Suggestions.

[ApexPredator]

I need some good card suggestions for a  {Prime Speaker Zegana} edh. Thanks in Advance.

[Weldrodson]

Terrastadon

[Particle]

Seems like flicker mechanics would work well.

[Double-O-Scotch]

{forgotten ancient}
{increasing savagery}
{simic manipulator}
{gyre sage}
{experiment one}
{fathom Mage}
{simic skyswallower}
{tree of redemption}
All the hydra's
{vorel of the hull clade}
{temple bell} or {otherworld atlas} + {consecrated sphinx}
{basalt monolith} + {power artifact}
{Hurricane} + {glacial chasm}
{instill energy}
{concordant crossroads}
{minion reflector}

[Caininite]

 {Master Biomancer}