Waite–Smith, Cups
Knight of Cups

What you can see
A rider wearing a winged helmet holds a cup before him. The horse walks with a lowered head near a winding stream.
What Waite says
Waite contrasts this quiet rider with a warrior and connects the image with imagination. His divinatory thread concerns approach, invitation or a proposal rather than the forceful charge seen elsewhere.
Waite · Part III, §2 · printed p. 202 ↗In the Thoth deck
Waite’s courts are King, Queen, Knight and Page. Thoth has Knight, Queen, Prince and Princess, so a rank does not carry straight across. See both ways to match them.
Edition and image credits
Pamela Colman Smith, illustrations in The Pictorial Key to the Tarot, Rider 1922 reprint, first published 1910. The scans keep the printed borders and page marks, with no cropping or recolouring.