The Payoff
"Taps all permanents and draws cards equal to the number of permanents."
Requirements
The Combo: Storyboard
1
Step 1
Cast the 'Ice' half of Fire // Ice targeting any permanent.
2
Step 2
In response, cast Radiate targeting the Ice spell.
3
Step 3
Ice is copied for every other permanent it could target.
4
Step 4
Every permanent on the battlefield is tapped, and you draw a card for each permanent.