- Start as Wallachia
- Declare war on both Poland and Moldova at the same time
- Make sure you have a big enough army in Bucharest that Moldova sends their army east and not south.
- After a little bit quickly run in and put sieging stacks on both Moldovan provinces.
- Wait a while. The Horde might come help you by assaulting, but don't rely on it.
- Annex Moldova. Poland should be offering a white peace by now.
- Get military access from Hungary/Transylvania; send your whole army there.
- Let the Horde fully occupy you. Lower military funding to 0 to make it faster.
- You're now a horde vassal. Start insulting the Ottomans.
a. If the Ottomans have not yet been dismembered by Castille + Venice + Naples, they'll declare war on you eventually. This will drag in the horde.
- Let the horde kill them, and occupy the one province you need from them.
b. If the Ottomans have been dismembered by the Latins, just wait.
- Wait.
- Wait.
- Wait.
- Break vassalage when the Horde's Khan dies.
- Hope Austria doesn't own Transylvania yet.
Though the Romanian Nation decision is pretty bad I have to say, as is the map around that whole region. But eh, if you don't care about pretty borders, it shouldn't bother you much.