Vedalken Orrery

You may cast spells as though they had flash.

Seedborn Muse

Untap all permanents you control during each other player's untap step.

At the beginning of each upkeep, untap all creatures and lands.

{T}: Add {C}.
{G}{U}, {T}: You may cast spells this turn as though they had flash.

If Leyline of Anticipation is in your opening hand, you may begin the game with it on the battlefield.
You may cast spells as though they had flash.