The converted mana cost of a melded permanent is the sum of the converted mana costs of its front faces
Normally, the opponent should be able to use this ability too, but if you swap the text with Deadpool, you can be the only one reaping the benefits
For the early game offensive, you can set up Pheromosa on your Active Spot to start dealing damage to all of your opponents creatures
Unforunately, that ability means that the owner of that Creature has to pay one mana in their upkeep to keep it, otherwise they have to sacrifice it
To illustrate, here are all three editions from the Base Set, back-to-back: The last set worth mentioning from this era is Base Set 2
Of course, fans will also be on the lookout for rares such as Ns Zoroark ex, which counts among the most valuable Double Rares in the set