Legion's Destiny

If you control your commander, you may cast
this card without paying its mana cost.
Until your next turn, you cannot lose the game
and your opponent cannot win the game.
Your life total cannot change. If this card would
be countered by a blue spell, you may exile cards
from the top of your library equal to the
converted mana cost of that spell. If you do, this
spell cannot be countered.