J, Eldritch Repurposer

Reach, shroud

{x}{u}: Exile target creature card with mana value X from any graveyard, put a +1/+1 counter on J, then make a token copy of the exiled card except it is a
0/1 blue illusion with “When this creature becomes the target of a spell or ability, sacrifice it.”

Whenever an illusion you control blocks or becomes blocked by a creature, J fights that creature.