Meld Cards Melding cards aren't considered double-faced cards as far as the game's rules are concerned, but they are cards with two faces, so it's probably still worth mentioning them
Conversely, this is exactly what Eldrazi Aggro is looking to do, so its not even the biggest deal that Ruins of Oran-Rief is worded differently so as to not give all your creatures +1/+1 (a nerf they surely made because of how insane the card is with Hangarback Walker)
The overall goal for the deck is have tokens readily available to not only keep out life at a reasonable place, but also leverage Trostanis populate ability, along with a choice few other cards that have the mechanic
However, even if this can hit attacking, blocking, and tapped creatures, it's inability to get a creature out of the way before it blocks, and the fact it can't deal with things with more than 4 toughness make it too restrictive to be great
If it's attacking or blocking, it still will be