Dina, teller of legends

Trample
{3} exile a legendary creature from a graveyard: put x +1+1 counters on a legendary creature you control were x is the exiled creature’s power
{3} exile a legendary creature from a graveyard: put x +1+1 counters on a legendary creature you control were x is the exiled creature’s toughness

Discard a legendary card: regenerate Dina

This card can only be your commander if ever card in your deck is legendary aside from basic lands