When using the Quick Tap keyboard shortcut - Press and Hold Q - to manually tap multiple sources at once, the Z keyboard shortcut to Undo does not function. Instead, the player must release Quick Tap and Undo the tap afterwards. This reveals to the opponent that you are manually tapping, whereas Quick Tap is used to obfuscate this.

Suggest including a QZ shortcut to undo all Quick Tap, or some other escape key to stop Quick Tap without activating the mana abilities.