This creates a finite supply, making cards on this list, like the original dual lands, extremely valuable regardless of their original rarity
Stalking Vampire, for example, has a mana value of 4 because the front face (Screeching Bat) has a mana cost of
Tokens Matter The Master loves keeping creature tokens around past their expiration dates, so Ive got a lot of other ways to make them that are usually temporary, like Heat Shimmer and Delina, Wild Mage
The need to attack with your creatures in order to receive a cost discount can be a bit awkward as it may force you to make some less-than-savory trades
Black/Red Sacrifice Kill your darlings to kill your opponent Black/Red is doing its standard thing of attacking a lot and killing off its own creatures for value
Anytime Gwaihir attacks you can give another attacking creature flying for the turn