Damage Stackers: Instead of effects that multiply damage output, these add a set amount of extra damage on top of it (Torbran, Thane of Red Fell, Jaya, Venerated Firemage, Mechanized Warfare, etc.)
Since Reaper King is what turns Scarecrows into spot removal spells for any problem in play, it goes without saying that protecting it at all costs is critical once youre able to safely play it
Blasphemous Act deals 13 damage to each creature
(Choose any number of permanents and/or players, then give each another counter of each kind already there.) Pay 1 life, Sacrifice another creature: Put a -1/-1 counter on up to one target creature and draw a card
Any strong Mim deck will probably run Skithiryx, but another classic Mimeoplasm kill is to have him become a copy of Blackcleave Goblin with 13 +1/+1 counters from Death's Shadow
Some more red looters