Will of the Gods, Help with Serendipity

[Dwarf99]

ok so I was looking at about 3 million points spent on serendipity (with wishing) and I came up to that little annoying part where it says

Originally Posted by Basic Page 83

one fortuitous but plausible coincidence per game session...
...the GM may rule that a single implausible coincidence counts as some or all of your lucky breaks for a given session

so what I was wondering is, how big of a modifier do I need to make it where the wishes never need to be plausible