Team America finally gets its own Mongoose / Sulfuric Vortex:

nemesis of identity 1UU
Merfolk rogue
When ~~ enters the battlefield, choose a player.
~~ has protection from chosen player (It can't be blocked, targeted, damaged, enchanted by a source controlled by this player)
3/1.

(early spoiler from the Commander set)

Ramping to 3 for TA is hardly an issue, and that's generally the point at which Mongoose becomes a real threat anyways.

A few major advantages:
1. Immune to GY Hate. Important for a deck that has a lot of its creatures heavily affected by stuff like Rest in Peace.
2. It's Blue. Maintaining a high Blue count is important for a 3-color deck that runs FoW.
3. Progenitus-like resiliency makes it just as good on defense as it is on offense. Especially good for holding off a Batterskull token while your Delvers/Stalkers get in for the kill. It also offers a solution to Mirran Crusader, which has been seeing a lot of play recently.

Swords to Plowshares was ALWAYS a problem for TA, since it lacked a maindeck shroud creature and doesn't have Burn to close out a stalled board state.

This is a card that should definitely be under consideration. Before this was spoiled, I was 99% sure that I was going to run BUG Cascade for the GP this November. Now I might need to reconsider going back to good ol' TA.

I think I would run 2-3 in the maindeck, likely replacing Tombstalker. Sure, it's a little slower than the demon in closing out a game, but it offers more inevitability. Testing will tell if more are warranted in the sideboard for your control matchups.