Top three protected in 2013.
Top two protected in 2014-15
Top one protected in 2016-17.
Unprotected 2018.

There are also stipulations that should the Raptors make the playoffs the pick gets deferred to the next season. This could come into play in future seasons if the pick gets deferred because of the above reasons. This lottery stipulation is in place until 2018, the same year the pick becomes unprotected.

So the Thunder would get the Raptors pick in the following scenarios:

2013 - 4-14
2014-15 - 3-14
2016-17 - 2-14
2018 - 1-30

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