Changeling (This card is every creature type.)

: Regenerate Skeletal Changeling.

Enchant creature

Enchanted creature gets +1/+1 and has ": Regenerate this creature."

As an additional cost to cast this spell, exile X cards from your graveyard.

You draw X cards and you lose X life.

Each Skeleton you control has trample, attacks each combat if able, and gets +X/+0, where X is the number of other Skeletons you control.

At the beginning of your end step, create a tapped 1/1 black Skeleton creature token. If a creature died this turn, create two of those tokens instead.

: Regenerate Skeletal Wurm.