Hibernation Caves

When this enchantment enters the battlefield, put a +1/+1 counter on a mutant creature with no +1/+1 counters.
{g/u}: Remove X +1/+1 counters from target creature, put X 0/1 spawn creature tokens with defender onto the battlefield.
{x}{g/u}: Sacrifice X spawn creatures, put a creature with converted mana cost X from your graveyard onto the battlefield.