Ancestral Exploration

As an additional cost to cast this spell,
exile X cards from your graveyard.
Surveil 1. If X is 3 or more, draw a card. If
X is 6 or more, return target instant or
sorcery card from your graveyard to your
hand. If X is 12 or more, take an extra turn
after this one. Exile Ancestral Exploration.