Sin, Unending Cataclysm
Legendary Creature — Leviathan Avatar, {5}{G}{U}
Oracle Text
Flying, trample
As Sin enters, remove all counters from any number of artifacts, creatures, and enchantments. Sin enters with X +1/+1 counters on it, where X is twice the number of counters removed this way.
When Sin dies, put its counters on target creature you control, then shuffle this card into its owner's library.