Doomed Stairway

Each player may pay up to one life to reduce
the casting cost of Doomed Stairway by {1}.
For each {1} the casting cost was reduced that
way, all players must Gaze into the Abyss once.
{2}, pay two life, {t}: All players must Gaze into
the Abyss. Each player may activate this ability.
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And even if it looks, like it's leading up,
there is only one way. Down. - Nietzsche