SilverRagingEternalFlame EV.

Devoid
Doublestrike, Deathtouch, Trample

Play this creature onto Silver for the rest of the game, it's mana cost is {r}{r}{r} for the rest of the game.

When this creature attacks, create zombie tokens equal to twice the number of creatures on the field. Vecna gets +1/+1 multiplied by 4 for each zombie on the field.

Summon Vecna to the field at your end step if they are not on the field.