Invalid targets and attempting to resolve effects
I’m currently trying to understand the rules on when it’s legal or illegal to activate effects, especially when there is a conjunction like “then” between two effects. Because apparently sometimes the effect after the conjunction doesn’t have to be able to succeed at the time of activation, it just needs to be able to be attempted? Is there any good rule of thumb about what kind of effects work like that?
Another confusing thing are invalid targets. In order for Monster Reborn there obviously needs to be a target that can actually be special summoned, but a targeted destruction effect can target a monster that cannot be destroyed by card effect and on resolve nothing happens. Same thing with effects of all kinds and monsters that are unaffected by card effects. You can still always “attempt” to affect them. Is this a distinction between effects on field vs. in GY or why do these effects work like this?