Skeletal Regisaur

Whenever a creature dealt damage by Skeletal Regisaur dies, you may pay life equal to that creature's mana value. If you do, create a token
that’s a copy of that creature, except it’s 1/1 and it’s
a Skeleton in addition to its other types.

{1}{b}: Return Skeletal Regisaur from your graveyard to the battlefield. Activate only if a nontoken creature other than Skeletal Regisaur died under your control this turn.