Kayn, Shadow Reaper

{t}: This creature deals 1 damage to any target
Whenever Kayn, Shadow Reaper deals
damage to a player, create a Shadow token.
At the beginning of your upkeep, if you control 5
or more Shadow counters and Rhaast, Darkin
Scythe, Exile Rhaast, Darkin Scythe and
transform Kayn, Shadow Reaper.
Partner With Rhaast, Darkin Scythe