When Aurelia attacks for the first time, you get another attack and untap your stuff
4 Energy is a 'lot', if you don't have ways of generating more of it, and while blowing up a single land a turn might seem slow, it is annoying, and Commander runs a lot of nonbasics
That last one is a particularly odd choice given its only shown up on a single card after its initial introduction in 2008's Shadowmoor block, but Heggen says it was explicitly used as a visual joke here: the symbol looks like the quarter-circle joystick motion required to do Ryus Hadoken ability in the video games
Thanks to this, its no wonder that Ragavan is so expensive Right
For 4 mana, you get the effect of Entomb and 2 copies of Natures Spiral allowing you to set up for some pretty powerful plays
King Arthur uses a sword called Excalibur and is on a quest for the Holy Grail