Forces of the Imperium excels in token creation and board control, with Marneus Calgar offering powerful synergies for card draw and resource generation
Knowing what your child is looking for can direct your purchase, so you don't blow their birthday budget on a pack they have no interest in
When this card is summoned, you can target any Fusion, Synchro, XYZ, or Ritual monster that you control (or is in your graveyard) and have all of your opponents monsters lose attack equal to that targeted monsters ATK
Few could predict this mixture could brew one of the most consistent and oppressive decks in the history of the game
However, if Dragon-type cards are taken into consideration, it is quite good actually
I have even seen Avacyn counterspell spot removal, which is comparably savage to a nasty combat against her