changeling mtg cards War-Spike [Modern Masters] Champion a creature (When this enters the battlefield MTGNexus - Envious Changeling

Don't see this being a thing in any sort of cube setting though

It shows how little the designers understood the game they had created that this card - which lets you draw three cards for one mana - was assumed to be roughly as powerful as Giant Growth, Lightning Bolt, Dark Ritual, or (of all things) Healing Salve

Put Erebos next to a free sacrifice outlet such as Viscera Seer or Phyrexian Altar and there is even more value

High impact

At that point, youre talking about an entire strategy revolving around infinite resourcessomething that should already fall under the umbrella of a Rule 0 discussion

Although desirability is somewhat discussed, the actual monetary value of misprints will not be