Board Thread:Plants vs. Zombies 2: It's About Time/@comment-4077536-20140307185825/@comment-27557697-20140309012217

I tried the fourth card once to see whether it was a permanent fourth option for the rest of the endless zone, or only for the one round. If you buy the 4th card, you have to re-buy it all other rounds. Maybe if it was 1000 coins to unlock a 4th card for the duration of the endless zone it might be more useful. Until then, not so much.