Clockspinning | Thousand-Year Storm | Crystalline Crawler

Cards

Cast
Clockspinning with buyback by paying ({3} magic symbol) ({U} magic symbol) , targeting
Crystalline Crawler.
Thousand-Year Storm triggers, creating a copy of
Clockspinning targeting
Crystalline Crawler for each other instant and sorcery you've cast each turn.
Resolve all copies of
Clockspinning, putting that many +1/+1 counters on
Crystalline Crawler.
Resolve the original
Clockspinning, putting a +1/+1 counter on
Crystalline Crawler and returning
Clockspinning to your hand.
Activate
Crystalline Crawler's first ability four times by removing four +1/+1 counters from it, adding ({3} magic symbol) ({U} magic symbol) .
Repeat.