you cannot Special Summon monsters, except DARK monsters, for the rest of this turn, also send 1 DARK Machine monster from your Deck to the GY, except "Orcust Knightmare", and if you do, the targeted monster gains ATK equal to the Level of the monster sent to the GY x 100, until the end of this turn
All five have real potential though, especially in decks that care about all three of their modes
During your Main Phase: You can Fusion Summon 1 Fusion Monster from your Extra Deck, using this card you control and other monsters from your hand or field as material
It works particularly well in this archetype because leave the graveyard cards are often triggered by other things that generate an advantage: You might return creatures to your hand with a Regrowth, reanimate a creature, play lands from your graveyard, etc
Just at a cost of two per go which is a pretty passable rate
Digi-parts can change the support effect and add a lot of DP - no card in the game can ever give more than 30, so this is excellent, it's like having an "instant evolution" card