Between ever-changing sideboards, identifying the right kind of redundancy and trying to consider card within the context of the format, Pioneer players have a lot of mental work on their docket
With the ability " Put the effort on " Incinerator ex could, under optimal conditions, perform the attack Burnout with just one Fire Energy
(6/18/2021) If you cast a card "without paying its mana cost," you can't choose to cast it for any alternative costs
Knowing Up the Beanstalk exists and is played regularly could have made for difficult choices when designing new cards, so WotC pulled the plug and banned it before it could inadvertently do some damage
The mana base also seems notably poor quality to me
The 1/1 Devils aren't fantastic, but if Raphael is in play then they're 2/2s with lifelink that deal 1 damage when they die, so they end up being a lot better than one might think