Darth Plagueis the Wise

Master of Sheev Palpatine

Myriad, soulbond

As long as Darth Plagueis is paired with another
creature, each of those creatures has "When this
creature dies, you may return it to the battlefield under
its owner's control at the beginning of your next upkeep."

The "legend rule" doesn't apply to creature tokens you
control.