The Eterna

This spell can't be countered, Hexproof
When The Eterna enters the battlefield, put X
time counters on it. Put X counters on The
Eterna every upkeep, if there are 100 or more
time counters on it, your opponents lose the
game.
—
"We don't know who created our reality, but they
left this to defend it." -Titus, The god of Realms