Romnidir, Eternity Wanderer

Flying, indestructible, defender
If you would lose the game or an opponent
would win the game, you win the game instead.
{w}{u}{b}{r}{g}: Romnidir, Eternity Wanderer
gains hexproof until end of turn. Each opponent
draws a card.
"Those who harness infinity hold no stock in the
squabbles of mortality. They simply wander at rest
along the lines of forever, unburdened and unworried."
- Yan, Prophet of Seasons