Horae, The Chronologist

At the beginning of each opponent's upkeep, if
Horae, The Chronologist is in the command
Zone, that player gains a Chono Counter.
At the beginning of each opponent's upkeep, that player gains a Chono Counter, then loses 2 life
for each Chono Counter they have.
{u}{u}{r}{r}, {t}: Target opponent takes an extra
turn.