Rin and Ello, New Friends

When this card enters the battlefield, create a
0/1 Human Child creature token named Rin.
if you don't control a creature named Rin,
sacrifice this card.
At the start of your upkeep, if you control a
creature named Rin, put a time counter on
this card. If this card has 3 or more time
counters, flip it and sacrifice Rin.