u/fawe4

Instant looks great, but I've already lost games thanks to Riddles in the Dark. 4 cards vs 5 is a thing, and then you draw three lands and one good card, and you will never get that one good card into your hand.

How can I know what exactly counts as a target spell or ability for 2nd ability of Return the Favour?

I understand that 2nd option can be used as a counter to counterspell. I cast it when opponent is countering my spell, then change the target of counterspell with Return the Favour, and my first spell will resolve.

It should also resolve against spells like Inevitable Defeat that have a condition that this spell can't be countered, since you're not technically countering it, but only changing targets.

It won't be available for spells that don't mention target in their description. For example, I can't change the target of spells like Stock Up, I can only copy those. Nothing in Stock Up mentions target, so that's logical, but why can't I activate 2nd option as response to Jeskai Revelation? Only first option can be selected in response to it. I can copy it. I can't change permanent targets, and I can't change damage targets, and I can't "counter" it by like I can counter regular counterspells.

Example:

Opponent casts Jeskai Revelation. Targets my creature to be returned to my hand. Why can't I cast Return the Favour as a response to it, chose 2nd option and change target of Jeskai Revelation to my Return the Favour, like I can in response to counterspells?