And of course Mirkwood Bats is the nastiest of all, bleeding each opponent on both your token creation AND sacrifice
If you would rather sacrifice those creatures for value than keep them alive, that is the aristocrats archetype: the same death-drain payoffs (Blood Artist, Zulaport Cutthroat) wired to an opposite plan
Serialized Rings of Power Realms and Relic Box Toppers Full-Art Middle-earth Map Lands The 1 of 1 Ring A Ring-bearer has found the 1:1 serialized The One Ring
Has the partner mechanic caused more trouble than its worth
Valgavoth is never depicted as literally warping the minds of his victims as Emrakul does, so Duskmourns delirium cards are tied to the traps and nightmares Valgavoth uses to torment those surviving in the House
The first copies, for free without needing any mana or other cost invested, your first instant, sorcery or artifact spell you cast each turn