Cursing a creature doesnt remove it but it can help slow your opponent down so Vantress Transmuter is perfectly desired here to slow down opposition, while Curse of the Werefox works in removal
It comes down early and powers out your key creatures then serves as a value engine later on when things get grindy
Some of these costing 1 mana means that, actually, we are not likely to get an infinite loop10 unless we somehow get the lands to have haste, but with the volume of land we expect to have, we should easily get to a point where we have upwards of 10 landfall triggers in a turn, which is somewhat mental
Colour is a general indication of a cards thematic and strategic place in the game
This can sometimes refer to self-mill, for effects that care about graveyard size or quality, as Lab Man/Thoracle or reanimator decks.
The saving grace for all these cards is that they can always be cast for 1 mana to secure your next land drop, making them great early on without being embarrassing later