Standard has plenty of all three of those at the moment, so Barricade is a solid answer to bring in from the board
Some of that is just good fortune in how all these effects are worded, but Id say its more that discarding is an inherently effective way to interface with Magic s core mechanics
That means that when you cast it, you get to exile cards from the top of your library until you hit a nonland card with a lower mana value, and then you can cast that card for free
Meanwhile, Goblin Electromancer can supercharge your slightly overpriced multicolored cantrips, giving you a solid engine to work with
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The payoff of creating tokens for casting noncreature spells is the main focus