When you cast a mana spell in your archetype more than your experience counter count you'll get one, and your spells you are built around cost that much fewer
For example, every Alpha common is rarer than, say, an Unlimited Black Lotusa whopping 18,500 of those were made
There's no reason to be coy about it
(They cant be the targets of spells or abilities your opponents control.) His kind was never known to run from danger. Moon-Boy Illustrated by Wero Gallo Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Legal Modern Not Legal Brawl Legal Legacy Legal Comp
It even is restricted in Vintage, and who doesnt care about this
Most good one and two mana spells gain a lot of tempo when used well and so the mildly below par 2/1 for 2 is more than offset by a Bolt or Path killing off a three or more mana card leaving you with a big tempo swing overall