Arya, Lyx Messan Prophet

At the beginning of your upkeep, scry X, where
X is the number of Islands you control.
{u}{u}, Exile the top card of your library, {t}:
Counter target spell if its converted mana cost is
equal to the converted mana cost of the exiled
card.
{u}{u}{u}{u}: Scry X, where X is the number of
Islands you control.