Evolved Sleeper

None of these abilities has a duration. If one of them resolves, it will remain in effect until the game ends, Evolved Sleeper leaves the battlefield, or some subsequent effect changes its characteristics, whichever comes first.

Evolved Sleeper's second ability checks whether it's a Cleric, and its third ability checks whether it's a Phyrexian. It doesn't matter how it became the appropriate creature type.

The effects from the first and second abilities overwrite other effects that set power and/or toughness if and only if those effects existed before the ability resolved. It will not overwrite effects that modify power or toughness without setting it (whether from a static ability, counters, or a resolved spell or ability), nor will it overwrite effects that set power and toughness which come into existence after the ability resolves. Effects that switch the creature's power and toughness are always applied after any other power or toughness changing effects, including this one, regardless of the order in which they are created.