The Mdma

As an additional cost to activate this artifact's
ability, sacrifice it with 5 time counters as
The Mdma enters the battlefield .
You get emblem "Creatures you control
gets +2/+7 for each time counter".
At the beginning of your upkeep, remove a time counter. When the last is removed, exile
The Mdma from your graveyard and your
emblem becomes "creatures you control gets
-2/-1 and defender for the rest of the game".