It has a low casting cost, and since many infect creatures are cheap to cast, it's likely you were able to get a few infect counters on your opponents, allowing for Yawgmoth to begin using its proliferate ability to add on more to them
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For example, an Elf Warrior token is named Elf Warrior
While its effects weren't horrible, it was severely let down by its attack restriction and the low power levels of Field Spell Cards
By activating its effect, Joey was capable of reducing the attack points of the card, granting the same amount of attack points to another monster on his side of the field
though these will sometimes have different artwork or designs, they will have a white back and will always each give +1000 Power, or provide one DON