(Unless you're Ken Nagle, in which case you do it right to left.) However, there's an important distinction to make here: you need to see what you're actually going to want to cast at each mana cost, not what you can cast at each mana cost
you can't cast it without sacrificing a creature, and you can't sacrifice additional creatures
They are just a predefined token cards sometimes create
A five mana 4/4 is nothing to write home about, and +4/+4 is quite a big bonus when it enters the battlefield, but in a format full of Nissa, Voice of Zendikar and Gideon, Ally of Zendikar, chump blocking is a pretty normal occurrence
Tiduss mechanics of passing counters around is a reference to the sphere grid and I believe the card draw is a representation of scoring points in Blitzball
Atraxa, Grand Unifier Atraxa, Grand Unifier has great keywords, the number of colors to be a useful 4-color commander, and a fantastic way to get some cards from the top of your deck