CAN I CARD USING ONLY ONE CARDING TOOL

hi so i have been interested in spinning and almost all videos i have seen thats cards the fibers are using 2 carding tools.

however, as unfortunate as it may be, i am broke and carding tool is expensive here (120 philippine pesos each) so i am thinking of only buying one.

Will that work as the same as 2 carding tool or do i really need 2 pieces