House Stark. No Leal.
Location. Coste: 1.

Old Gods. Winterfell.

Reaction: After a phase begins, sacrifice Winterfell Heart Tree to choose a card you control. Until the end of the phase, that card gains "immune to opponents' plot effects."

Cristi Balanescu
Wolves of the North #18.

Link: Decklists

Winterfell Heart Tree

Rules FAQ

Winterfell Heart Tree is a reaction to a phase beginning. First Snow is a Forced reaction to the challenges phase beginning, and Forced reactions always happen before normal reactions, so the Heart Tree is too late in that scenario.

If used in the plot phase, the Tree must be used **before** players choose plots. — mplain 176
Can this be used with the Withering Cold? Will the character stand? — Stathis 1