[c]Narcomoeba[/c] and [c]Prized Amalgam[/c] are known for entering the battlefield without having to pay mana, meaning that if you can fill your graveyard with such cards, youll soon have a bunch of creatures
Most commonly Kaheera gets played in decks that don't have any creatures at all (and as such is just a freebie that might have some relevance in grinding Game 1s)
Artifact Color tag templates(None) The Cauldron of Eternity This spell costs less to cast for each creature card in your graveyard
Jace mainly acted as a one-two punch, as two copies later on in the game could finish off your opponent, milling them for 30
A truly colorless creature needs to be unaligned with what the five colors of Magic can do, and it cant do something neutral and particularly powerful for a cheap cost since that would be easily exploitable
While on the surface Goad may appear rather straightforward, there are some niche corner cases