Dark patterns are present in many places on the Internet in a wide variety. The multifaceted nature of deceptive designs suggests that different dark patterns may use different mechanisms to deceive, and that these may be accumulated when various dark patterns are faced at the same time. Based on this, this study examined three dark patterns that were expected to have different effects on perceptual, emotional, and motivational aspects of decision behavior. In an online experiment, the three dark patterns preselection, confirmshaming, and disguised ads were examined separately and in combination. The effects on decision behavior, negative emotions, and dwell time are collected. It is shown that disguised ads in particular increase the error rate and dwell time in decision tasks. The combination of all three dark patterns leads to both enhanced and attenuated effects for decision making and transaction costs. This highlights the need to investigate deceptive design in a more sophisticated way with respect to the mechanisms of specific dark patterns. The present work encourages to a more nuanced view on the theorizing and investigation of dark patterns.