Lord Bothos, Anea Loyalist

Whenever a creature you control dies, put a soul counter on Lord Bothos, Anea
Loyalist. When Lord Bothos dies, you may return another legendary creature with
mana value X or less from your graveyard to
the battlefield, where X is the number of
soul counters that were on Lord Bothos
when it died. If you do, exile Lord Bothos.