Legendary Creature - Cleric Elf Anthem (CTRL to add secondary) Counters Ezuri, Claw of Progress Whenever a creature you control with power 2 or less enters, you get an experience counter
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Like most Magic: The Gathering cards, the value of Gold Myr depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Scars of Mirrodin)
It's quite mathy, but he goes into a great deal of detail and explains his rationale, while not ignoring the realities of the game (there are one-mana Cycling cards, cards that fetch lands, cards that tap to add mana which aren't lands, and more.)
Its essentially most of a Champions Helm but for a good deal less mana, especially if your creature is three or more colors