Whoever draws the most cards and spends the most mana tends to win games, and these two cards give your opponent the option of choking themselves on mana or giving you a card and mana advantage
Mostly doom
Experience thrilling battles with your favorite Pokmon
They will not overwrite effects that modify power or toughness without setting it (whether from a static ability, counters, or a resolved spell or ability), nor will they overwrite effects that set power and toughness which come into existence after they resolve
Then, any time they draw a card, you will also draw a card, so long as they still control that Wedding Ring token
A combination of decent playability and extreme rarity had collectors scrambling to get their hands on this card, driving the value and expense of a single raw copy through the roof, with a single pack-fresh card costing collectors around $350 or more