Jon Snow, King of the North

Creatures you control get +1/+1.
When Jon Snow, Lord of the North enters
the battlefield, you may search your library for a
basic Plains or Swamp and put it onto the battlefield tapped.
When Jon Snow dies, return it to the
battlefield at the beginning of your next upkeep.
"Kill the boy and let the man be born."
- Aemon Targaryen