Dancer of the Boreal Valley

Haste, double strike

When Dancer of the Boreal Valley enters, surveil X, where
X is the number of cards in your hand.

Whenever Dancer attacks, target X creatures get X -0/-1 counters, where X is the number of surveilled instant and/or sorcery spells put into the graveyard this turn.

Whenever you surveil, if Dancer is tapped, untap it. If it's not tapped, instead draw a card and it gets shroud until
the beginning of your next upkeep.