We all know how broken this can be at the kitchen table with free cards from a three-color drop that cannot be easily targeted (cough...Narset, Enlengthened Master...cough)
Amalia Benavides Aguirre caught a ban in Pioneer thanks to the combo with Wildgrowth Walker, which you sadly cant pull off with Amalia in the command zone
There are also cards that let you gain mana rapidly even early in the game, or rifle through your deck to select a specific card, or still other special powers that compound the power of the awful beast youre chained to
In that light, creating block monsters sounded like a pretty good idea to encourage more players to jump into Standard
It has flash and flying, nice combo for blocking attacks and then attacking over grounded foes
Think Baba Lysaga, Night Witch or Inquisitor Greyfax