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1st: You cast Dark Ritual (1)
2nd: Then cast Doomsday (2) stacking your deck with IU, LED, Probe, LED, BW.
3rd: Play Petal (3)
4th: Play LED (4)
5th: Pay two life for probe (5) retain priority...

You are going to have to goldfish a lot. Iggy has fallen out of favor of late, most people have or are cutting that card from the sideboard. If you are trying to set up pass the turn piles on turn...