Crystalline Cavern

Deploy {t} {x} = {p/b}{p/c}{p/g}{p/r}{p/u}{p/w}
{t} {x}
{2} Convert Essence {p/b}{p/c}{p/g}{p/r}{p/u}{p/w}
Start Phase 5+ Essence - If a card in hand
has cost 3+ Essence colours
— you may pay 1 Essence for {1} instead