This is a problem, but priest straight up stealing win conditions, including tickatus, for 2 mana or less is totally fine. I cant tell you how many times my control decks get sniped by priest and they use my tickatus to burn my deck then my yash to do it again.
Tickatus can’t be played before turn 8 most of the time, cause you need to play a 7 to corrupt him (and have him) . And most aggro decks make you sad way before then. This card is meant to beat combos and other control decks and it works for that.
Is it frustrating yup, have I also burned 5 soul shards in a row on the enemy player, yup.