If you don't have a creature to spare, don't worry: Kaldra Compleat is a living weapon, so it makes a 0/0 token to attach to when it comes into play
We want a critical mass in play, but we can certainly do better than what the precon offers initially
Whenever this enchantment becomes the target of a spell, that spells controller loses 5 life
That can be crucial in helping plan your next turn - and even the turn after that - knowing exactly what options your opponents have available
On a later turn, you can then cast the card for its foretell cost instead of its normal mana cost
This ranges from +1/+1 counters on a creature you control to -1/-1 counters on a creature you (ideally) dont control to planeswalker loyalty counters, charge counters on artifacts, level-up counters, etc