Like everything else on a cards type line, supertypes act as markers that can be referenced by other card effects (e.g., Target legendary permanent)
but because all of them have very different playstyles that'll suit different kinds of person, it pays to get a heads-up on what they can do before making a decision
Being able to complete your turn without interruption can often be game winning, and for colors without access to interaction on the stack to prevent blow outs, Grand Abolisher is a great investment
I think if you are running an aggro list, this is a great card
Unfortunately, it can be hard to use this aggressively, using this to spawn a bunch of creatures from your graveyard and attack for a turn before they diethey don't gain haste
Non-foil Reprints Finally, the deck features 10 double-faced tokens