Itll cause absolute chaos on the ladder for a long time, with people optimizing for poison wins every way they can, in every color they can
As a play, theyre decent, especially if youre playing at a higher power level and need to not rely on an opponent (misdirect) or cant have summoning sickness get in the way of your creature (needing haste)
This is a sort of inevitability that could be everything in this longer game
Card draw is always good, but being able to lower the strength of two opposing characters will hopefully allow you to challenge and remove an opponents characters without losing your own
Enchantment Color tag templates(None) Haunted Library Whenever a creature an opponent controls dies, you may pay
Lastly, I want to talk a bit about Absolute Virtue