For the Marvel set, Rosewater made a file of the most important thing that needs to be captured for each character
There's a big advantage to sneaking it onto the battlefield, despite the cost, because when it deals combat damage to an opponent, you can pull a creature from that player's graveyard, which then enters the battlefield under your control, tapped and attacking that player
Some (Electric Pokmon do bonus damage) can be used to your advantage as well, but how is removing the weakness of Fire types going to help against the Fire type user who has no Water types in the first place
When drafting these color combinations, the cards you see lean heavily towards supporting these strategies
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It will not trigger if a creature became blocked as a result of some kind of effect, not by creature