An opponent controls a creature with toughness six or less.
You do not control an Army.
Mana Needed
({11} magic symbol) ({R} magic symbol) available.
Steps
Activate
That Which Was Taken by paying ({4} magic symbol) and tapping it, putting a divinity counter on a creature an opponent controls with toughness six or less.
Activate
Fall of Cair Andros by paying ({7} magic symbol) ({R} magic symbol) , dealing seven damage to the creature that has a divinity counter on it.
Fall of Cair Andros triggers, creating a 0/0 Army and putting at least one +1/+1 counter on it.
When the Army enters the battlefield,
Pandemonium triggers.
Holding priority, activate
Phyrexian Altar by sacrificing the Army, adding one mana of any color.
Resolve the
Pandemonium trigger, dealing 1 damage to the creature with a divinity counter on it.
Repeat from step 3.
Once you have infinite mana, with a
Pandemonium trigger on the stack, you may use
Fall of Cair Andros' ability to deal infinite damage to the creature with a divinity counter on it, thus causing the Army to have infinite +1/+1 counters on it, which causes the
Pandemonium trigger to deal infinite damage to any target.