Leyline of Negation

If Leyline of Negation is in your opening hand,
you may begin the game with it on the battlefield.
You may discard 7 cards instead of paying Leyline
of Negations Mana cost.
Whenever opponent casts a spell, counter target
spell unless they exile cards from their library or graveyard equal to its mana cost. Cards with
Suspend have a converted mana cost equal to their suspend cost.