Crystalline Crawler and another creature you control have at least five +1/+1 counters on them.
({4} magic symbol) ({W} magic symbol) available.
Steps
Activate Resourceful Defense by paying ({4} magic symbol) ({W} magic symbol) , removing all +1/+1 counters from a creature you control with five or more +1/+1 counters on it, and putting twice that many counters on Crystalline Crawler.
Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters, adding ({4} magic symbol) ({W} magic symbol) .
Activate Resourceful Defense by paying ({4} magic symbol) ({W} magic symbol) , removing ten +1/+1 counters from Crystalline Crawler, and putting twenty +1/+1 counters on another creature you control.
Activate Crystalline Crawler's first ability five times by removing five +1/+1 counters, adding ({4} magic symbol) ({W} magic symbol) .