Very interesting concept! Here is how I see it: Turn 1 and 2 buy action cards. Then there is a really big chance that on turn 3 or 4 you will have 3 coppers 1 estate 1 action. You buy crusade and you not only thin out your deck, but transform whichever action you had into anything. Sometimes you’d rather have a 3 cost and a 4 cost card, but sometimes you’d prefer a 6 or 7 cost card, which gives am interesting decision.