Tom Riddle

Deathtouch
—When Tom Riddle enters the battlefield create an
emblem with one Horcrux Counter on it. If this
creature were to be exiled or destroyed remove one
counter from the emblem then if there are no more
Horcrux counters sacrifice Tom Riddle.
Whenever a creature is destroyed by this creature
or an instant or sorcery spell you control create a
Horcrux counter. Once you have seven Horcrux
counters flip Tom Riddle.