Both characters then deal damage to each other equal to their Strength (the attack power stat on the card)
Obviously, you need to have 4-5 cards with Proliferate to really unlock this, but that doesnt seem like a big ask, and the floor of the card is so good that it is hard to look at this as anything less than amazing
Ancient Silver Dragon is a blue Elder Dragon creature, which makes sense given its affinity for cold
In fact, the sets were widely considered failures by the game's players and designers, which is weird, because for me they were, at the time and even today, the best sets available
So your final deck with MTGA's minor auto-land adjustment will be 40 cards: 22-24 nonland and 16-18 lands, which is on par with a typical Limited deck