Thnitos

Thnitos enters the battlefield with X-1 metamagic counters on him. At the end of your turn if
Thnitos is untapped put a metamagic counter on
Thnitos.
{t}{b}{w}: remove up to X metamagic counters on Thinitos, choose one:
-You can cast a Sorcery spell with converted mana
cost X as it were an istant.
-You can copy the next instant or sorcery with converted mana cost X you cast this turn.