Sasaya, Orochi Ascendant // Sasaya's Essence

Each Ascendant is legendary in both its unflipped and flipped forms. This means that effects that look for legendary creature cards, such as Time of Need and Captain Sisay, can find an Ascendant.

If Sasaya's Essence's controller has four Mossfire Valley and taps one of them for {R}{G}, the Essence will add three mana (one for each other Mossfire Valley) of any combination of {R} and/or {G}.

You don't need to have seven lands in hand to reveal your hand. You leave your hand revealed until the ability resolves. If you don't have seven or more land cards in your hand at that time, the effect does nothing.

You don't need to tap Sasaya to use its ability, so you can activate the ability on the turn Sasaya comes under your control.