Go to collection
Select "All sets"
Check both "Collected" and "not collected"
Search on "gain control of" (with the quotes) and note that lots of cards show up that give you temporary control of a creature.

Search on:
"gain control of" -"end of turn"
(including the quotes, with space after the first phrase, before the - for the second phrase).

Actual result: You get 5 cards. 3 of them say "end of turn" in their text.

Expected result: You only get cards without "end of turn" in their text.