Hook-Handed Dervish

When Hook-Handed Dervish enters the battlefield
with four tock counters on it. Each time
Hook-Handed Dervish attacks, remove a tock
counter from it. When Hook-Handed Dervish has
no tock counters on it, sacrifice Hook-Handed
Dervish and create a 5/5 legendary hexproof
dragon token creature with flying named Riseppa,
the Time Swallower.