The Seal of Orichalcos

Creatures you control get +3/+3.
Exile all tokens, and non-land permanents that
were cast without paying their mana cost.
As long as this card is on the battlefield,
spells may only be cast by paying their mana cost,
and neither player may create tokens. Cards sent
to the graveyard are exiled instead.
Once each turn, you may negate a spell or ability
that targets this card.
If this card is destroyed or exiled, remove it from
the game instead.