Farron Keep

Whenever you cast your first creature spell each
turn, put a beacon counter on Farron Keep.
{1}, {t}: Add {c}{g}. Spend this mana only to cast creature spells.
{6}, {t}, Remove four beacon counters from Farron
Keep: Search your library and/or graveyard for a legendary creature card, reveal it, put that card into
your hand, then shuffle.