Black Magic is primarily damaging elemental spells, White Magic is healing and support, Red Magic blends the two, while Blue represents an ability to absorb and learn the skills of an enemy opponent
The trigger event doesn't have to specifically refer to "creatures." In these cases, the trigger event may also refer to something being "put into a graveyard from the battlefield." For example, if the equipped creature or an emblem you own has an ability that triggers "whenever an artifact is put into a graveyard from the battlefield," that ability would trigger twice if an artifact creature died
As a result, seasoned Commander players know to deal with a Walking Ballista immediately, lest they be gunned down unceremoniously when Heliod, Sun-CrownedHeliod, Sun-Crowned or Mikaeus, the UnhallowedMikaeus, the Unhallowed come around
His initial side allows him to draw and discard cards quickly, allowing you to build up cards in the graveyard that can be used once he's been transformed