If the copied creature is copying something else, then the token enters the battlefield as whatever that creature copied, with the exceptions noted above
Weve had so many reprints of Cultivate, Kodamas Reach, Natures Lore, Harrow, and so on that you could probably build a deck for $50 and outpace $400+ decks
Each turn you put a counter on Palantr to increase the amount of X, so the risk for your opponents gets bigger every turn
The partner keyword also gives them a buddy, and Ardenn is often paired with Rograkh, Son of Rohgahh for some quick kills
In a proper Izzet deck with lots of spells, Wee Dragonauts gets in for huge damage each turn
If you want to start building the skill yourself, a good way to start is to make a list of the top 3 Commons and top Uncommon for each color and then compare with your friends