Tolarian Watchtower

{t}: Add one mana of any color. Spend this
mana only to cast instant or sorcery spells.
You may exert Tolarian Watchtower as you tap it
for mana. When you do, choose one —
• Scry 1.
• Until end of turn, spells you cast can't be
countered.
(An exerted permanent won't untap during your next
untap step.)