Change Two Letters Game v2.0

Perhaps we can have a round of Killer Change Two Letters next, I'll think about the rules.
I don't see how this is going to work. The obvious strategy is to make the word as long as possible as quickly as possible, so it will be done in maybe 10 plays max. Suggestions welcome.
 
If you can have "Pi", I can play

Xi

Isn't this straying into the bounds of Scrabble words that are tantamount to cheating?

Oops! Belay that, Xi's a deviation.
 
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