Hi there,
I have some doubts about the Deadly effect of Walder Frey. Here is the definition of this keyword from the rules :
"During a challenge, if the attacking player controls the most participating characters with the “Deadly” keyword, the defending player must
choose and kill a defending participating character after the challenge resolves."
1) Lets say I control Walder Frey and I attack my opponent with a total STR 2 and a Deadly Character.
He defends with 3 STR, no Deadly. Walder Frey jumps in on his side making his total STR 7. Then somehow I manage to boost my STR to 7.
So on each side there is 7 STR and one Deadly Char. However the attacking player controls 2 Deadly characters and the defending player controls 0 Deadly character.
Looking a the "Deadly" definition the defending player will have to choose and kill a defending participating character, not necessarily one he controls and so the defending player might kill Walder Frey himself.
2) In a Melee game, my Walder Frey jumps in a challenge in which I'm not participating. Because he is not controlled by the attacking nor the defending player, only his STR will count but his Deadly keyword will have not be taken into account.