Im not sure, but I love the idea of making them unblockable while I buff them with huge spells
For example, if you attack the chosen player with a 5/5 creature with trample and it's blocked by a 2/2 creature they control, you can assign 2 damage to the blocker and 3 damage to the defending player
The rampier you are, the more mana you can make each turn and this will let you do something each turn with that Cabal Coffers or Nykthos to save it for a later X spell
All this justifies its price tag of $10.99
Today, we get not one, but two more songs matter cards
Two commanders are better than one, since they unlock new card options and new synergies, as well as ensuring you always have a creature to play out