Nut Signal is a super-rare plant superpower trick card in Plants vs. Zombies Heroes, and a member of the Guardian class. It costs 1 to play, and its abilities make a Wall-Nut on a selected lane, and draw a card.
Call on Wall-Nut any time. His schedule is wide open.
For more strategies, see Wall-Nut.
This trick is basically like playing a Wall-Nut, with the additional benefit of gaining a card. Use this trick as you would use Wall-Nut, or when you are low on cards. Like a lot of superpowers, it can be a last-ditch effort for survival.
Since this trick is basically playing a Wall-Nut but with the extra benefit of drawing a card, any strategies that apply against Wall-Nut normally also apply to this.