Sealàh, Born of Stratos

Eminence -Whenever you cast an instant or sorcery
spell, you may play a land from your hand.

When you cast Sealàh, Born of Stratos, exile the top {x} cards of your library, where {x} equals the
amount of instants and/or sorceries in your
graveyard. You may cast any amount of instants
and/or sorceries revealed this way with mana cost
equal to the amount of lands you control without
paying their mana cost. If those cards would be put
into the graveyard, exile them instead.