Spark of the Vicious Swarm

Enchant target creature. It loses all types and
becomes a planeswalker and gains loyalty equal
to its mana value.
It has the following loyalty abilities.
+1: Put a +1/+1 counter on target creature.
-10: Create an artifact with creatures you control
get +X/+X and creatures your opponents control
get -X/-X when X is the number of creatures you control.