Temporal Conduit

Each player chooses upkeep, draw, combat, or
end during his or her untap step. If Temporal Conduit is untapped, that player takes an extra step or phase of the chosen type immediately after the first chosen step or phase this turn. If Temporal Conduit is tapped, that player skips
the chosen phase this turn.
{2}: Tap or untap Temporal Conduit. Only the active player may activate this ability.