If needed, animate the land, causing it to become a creature.
Cast Light of Promise by paying its mana cost, attaching it to the animated land.
Activate Black Panther by paying 3, moving all +1/+1 counters from the animated land to Crystalline Crawler, then causing you to gain at least 3 life and draw a card.
The animated land triggers, putting at least three +1/+1 counters on it.
Activate Crystalline Crawler three times by removing three +1/+1 counters from it, adding 3.