Dark Dragon's Seal

{t}, Tap an untapped creature you control with converted mana cost 3 or greater: add a needle
counter to Dark Dragon's Seal.
{t}, Remove seven needle counters from Dark
Dragon's Seal, sacrifice it: Each player places all
lands they control into their graveyard. Create a
white and black 12/12 Elder Dragon creature
token with trample, flying, hexproof and indestructible.