Deadly Invaders

Bestow {1}{b} (If you cast this card for its bestow cost,
it's an Aura spell with enchant creature. It becomes a
creature again if it's not attached to a creature.)
When Deadly Invaders enters the battlefield, distribute three -1/-1 counters amongst any
number of target creatures.
Deadly Invaders and enchanted creature get
+1/+1 for each -1/-1 counter on creatures you
don't control.