Alien Eggs Hatching

Enchant Player
At the beginning of enchanted player's upkeep,
that player puts a parasite counter on any target creature they control.
Creatures with parasite counters on them, must
attack and block each combat if able. When they
deal combat damage to a creature, that creature
gets a parasite counter.
When a creature with parasite counter on it dies,
you create an Alien token with X +1/+1 counters
on it, where X is that creature's power.