The Wall of Thermopylae

Defender, Indestructible
Whenever The Wall of Thermopylae is declared
as a blocker or is the target of a spell, create two
1/1 white Soldier creature tokens with defender.
You may pay {x} to repeat this process X times.
If you control at least three hundred Soldier
creatures, you can't lose the game and opponents
can't win the game.