mtg sliver cards Groundshaker [Magic 2014] Unearth only as a sorcery.) Art by Zack Stella Sliver Deck - Very Powerful

As a member of the MTG Finance subreddit pointed out last month, the whole creature type seems to be getting a lot more support of late

The elves believe that unless the Cosmos Serpent is free to roam the realms, the World Tree will surely dieand all the realms with it

One of the best things about the card is how flexible it is on the mana cost

Kaito is the best Planeswalker seeing play at the moment (though Elspeth, Storm Slayer is lurking in the shadows) and should continue to see play after rotation

You can morph it for three and then unmorph for five so it might be good enough but I found it intriguing enough to consider