If we played 80 cards instead, wed still have the same ten fetchable lands, but now we could play nineteen fetchlands (while actually playing a very slightly lower percentage of total lands in our deck)
So long as you're running green, Spring-Leaf Avenger is just one of those creatures that can fit into the deck
The combination of evasion, card selection, and combat tricks makes Kamiz a strong Commander option
Perhaps in the modern era we should be telling people reading the Oracle text explains the card instead
Because there is no hard stipulation for whether or not a player needs to actually pay a chosen X amount, players have interpreted this as an opportunity to simply declare what the X amount would be - and then choose not to pay it
The triomes are pretty good, as this helps provide the red mana needed for some of the big spells, while still being fetchable with all fetch lands