Seiju, Cliff Town

Seiju, Cliff Town enters the battlefield tapped.
When Seiju, Cliff Town enters the battlefield,
discard a card.
{t}: Add {u}. If this mana is spent on an instant
or sorcery spell, that spell can't be countered.
{t}: Add {c}. If this mana is spent on a spell, that
spell can't be countered.
The haven to eternity.