Dorrfnir, Twisted Visions

Changeling (This card is every creature type.)

Vigilance, protection from creatures

Ally Weaver - Whenever a creature deals combat damage
to you, you may gain control of that creature. If you do, that creature becomes a blue Spirit creature with base power and toughness 1/1 and gains flying.

Whenever a creature you control but don’t own dies, return it to the battlefield under its owner’s control.