Sir Tankterton, the Steadfast

This spell can't be countered.
Convoke, Vigilance
Sir Tankteron can block an additional creature
each combat.
Whenever Sir Tankerton blocks, he gets +X/+0
until end of turn, where X is the number of
attacking creatures.
As long as your life total is 5 or less, Sir Tankerton
has lifelink.
You can't lose the game and your opponents
can't win the game.