Alongside the Hivelord, Battle Sliver and Megantic Sliver give you uses for your extra mana to turn your Sliver army into an enormous force
For a more non-technical analysis on fake cards affecting the game, I recommend reading this article
Some cards like Horn of GreedHorn of Greed only count when you play a land, but Tatyova will trigger not only for your land drop each turn, but also for your spells that put them into play, such as CultivateCultivate, Skyshroud ClaimSkyshroud Claim, or better yet, Boundless RealmsBoundless Realms
Chocobo Kick has been even better than expected, and it fights closely with Summon: Fat Chocobo and Town Greeter for the title of best green common
An argument could be made to include The Master, MultipliedThe Master, Multiplied in this upgraded deck, but I'll leave that up to you
Sunstreak Phoenix can alter the day/night cycle and return from the graveyard to the battlefield as days and nights change