Lomys's ability reads:
" Any Phase: Kneel Maester Lomys and discard 1 power each from any number of characters you control to have each of those characters gain 'cannot be killed' until the end of the phase."
Young Griff's ability reads:
" Response: After Young Griff comes out of Shadows, stand any number of characters you control. Then, you may immediately bring another card out of Shadows by paying the rest of its gold cost."
1. The 'then'-part of Griff's response only resolves if you stand at least one character successfully.
2. You may only pay the cost of a triggered effect that can resolve successfully.
The questions:
Does this imply "3. You have to discard power from at least one character in order to trigger Lomys's effect."?
Or does the 'then'-wording create an exception regarding resolution requirements?
Is it possible to get a general ruling on how to treat the 'any number'-wording?