Much like Sab-Sunen, Ketramose cant attack or block unless there are seven or more cards in exile split across all players
Also, as an added bonus, it gives vigilance and lifelink to all your tokens
Speaking of white removal, we did get a better example in todays MTG Final Fantasy leaks
Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.) Sorcery Urza, Lord High Artificer When Urza enters, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control." Tap an untapped artifact you control: Add
At face value this card shares a lot in common with the MDFC lands from Zendikar Rising
Make sure to try and close the game quickly once you start evicerating our opponents hands and boards, as if they can't remove Tergrid they are defenseless and you must press on the attack